However, unlike tracheal tubes it does not seal against aspiration, making careful individualised evaluation and patient selection mandatory.

However, expressing these properties as axioms requires use of second-order logic.

However, to go further requires new capacities that combine the clarity of intellectual thought with the imagination, and beyond this with consciously achieved inspiration and intuitive insights.

However travel through very remote areas, on isolated tracks, requires planning and a suitable, reliable vehicle ( usually a four-wheel drive ).

However the IRS now requires barter exchanges to be reported as per the Tax Equity and Fiscal Responsibility Act of 1982.

However the Bill of Rights of 1689 requires Parliamentary consent for the Crown to maintain a standing army in peacetime.

However, the discrete and separate nature of the molecular concept usually requires that molecular ions be present only in well-separated form, such as a directed beam in a vacuum in a mass spectrograph.

However, its practical limitations — it requires the sun to shine and does not work at all during the night — encouraged the use of other techniques for measuring time.

However, firing a pistol effectively at any significant range requires good training, since the absence of a buttstock makes precise ranged aim difficult.

However, this tends to be complicated by the fact that this requires finding the roots of a high degree polynomial, and there can be multiple roots that represent local maxima.

However, U. S. law permits " blended " whisky to contain up to 80 % un-aged grain neutral spirits ( with an age statement on the label that refers only to the " straight " part of the blend ), while Canadian law requires that all of the spirits in a Canadian whisky be aged for at least three years.

However a high index of suspicion is appropriate, since diarrhea and bloating are also symptoms of typhlitis, a very serious and potentially life-threatening medical emergency which requires immediate treatment.

However, attempts made in closed-door sessions at the Fourth Plenary Session of the 17th Communist Party of China's Central Committee in September 2009 to grapple with these problems produced inconclusive results, although a directive which requires disclosure of investments and property holdings by party and governmental officials was passed.

However, existing law requires judicial approval of all class action settlements, and in most cases class members are given a chance to opt out of class settlement, though class members, despite opt-out notices, may be unaware of their right to opt out because they did not receive the notice, did not read it, or did not understand it.

However, often, the required output signal is another analog output signal, which requires a digital-to-analog converter ( DAC ).

However this behaviour is application-specific, and requires that the application maintains a catalog of known URNs to resolve them into the notations that have been parsed in a standard SGML or XML parser.

However, DSN tracking requires many skilled operators, and the DSN is overburdened by its use as a communications network.

However, technology transfer requires knowledgeable managers and engineers who are able to operate new machines or production practices borrowed from the leader in order to close the gap through imitation.

However, electrolysis requires an external source of electrical energy to induce a chemical reaction, and this process takes place in a compartment called an electrolytic cell.

However, the church asserts that Apostolic Succession also requires Apostolic Faith, and bishops without Apostolic Faith, who are in heresy, forfeit their claim to Apostolic Succession.

However, technology maturity requires a further understanding of the technology itself.

However, if the decomposition into given above is possible, then requires storing 4 values, requires storing values, and again requires storing just 4 values.

However, due to lack of intermediate elements, this process requires three helium nuclei striking each other nearly simultaneously ( see triple alpha process ).

However, the inquest should set out as many of the facts as the public interest requires.

However, as witnessed by the large corporate bond calendar at present, as well as the record amount of municipal bond issues approved by voters, the over-all demands for capital funds seem likely to remain high, so that any downward pressure on rates from reduced demand should not be great.

However, while Apollo has a great number of appellations in Greek myth, only a few occur in Latin literature, chief among them Phoebus ( ; Φοίβος, Phoibos, literally " radiant "), which was very commonly used by both the Greeks and Romans in Apollo's role as the god of light.

However, he did take a great interest in the revision and practice of the law throughout the empire.

However, the Vandals loot a great amount of treasure.

However, Buddha said that the purity of his heart was so great that, " Should Ananda die without being fully liberated ; he would be king of the gods seven times because of the purity of his heart, or be king of the Indian subcontinent seven times.

However, in a decision of great historic significance, the Persian king Darius the Great decided that, despite successfully subduing the revolt, there remained the unfinished business of exacting punishment on Athens and Eretria for supporting the revolt.

However, his training in Wolgemut's studio, which made many carved and painted altarpieces and both designed and cut woodblocks for woodcut, evidently gave him great understanding of what the technique could be made to produce, and how to work with block cutters.

However, it was recovered on 27 August 1922, a key moment in the great Turkish counter-attack in the Aegean region.

However, many " free " BBSes also maintained close knit communities, and some even had annual or bi-annual events where users would travel great distances to meet face-to-face with their on-line friends.

However, Marlborough was convinced of the urgency – " I am very sensible that I take a great deal upon me ", he had earlier written to Godolphin, " but should I act otherwise, the Empire would be undone ..."

However, this saga makes no mention of the great necklace.

However, in 1939, an injury forced Lancaster to give up the profession, with great regret.

However, prior to the abolition of slavery, Cuba gained great prosperity from its sugar trade.

However, Thebes produced Pelopidas, her first great cavalry commander, whose tactics and skills were absorbed by Phillip II of Macedon when Phillip was a guest-hostage in Thebes.

However, the best modern analysis of the sources of the creed ( by A. de Halleux, in Revue Theologique de Louvain 7, 1976 ) and a reading of the acts, or proceedings, of the council ( recently translated into English ) show that the bishops considered Cyril the great authority and that even the language of ' two natures ' derives from him.

However the great majority of families were headed by farmers, fishermen, craftsmen and laborers.

However, the difference is not as great as it seems, because it really hinges on the definition of " faith " used.

However, in the English-speaking world, there tends to be a great deal of uniformity in order of service and hymnody.

However, the flyby of Comet Borrelly was a great success and returned extremely detailed images of the comet's surface.

However, justification of the award may accrue by virtue of exceptionally meritorious service in a succession of high positions of great importance.

However, justification of the award may accrue by virtue of exceptionally meritorious service in a succession of high positions of great importance.

However, because the SEM image relies on surface processes rather than transmission, it is able to image bulk samples up to many centimetres in size and ( depending on instrument design and settings ) has a great depth of field, and so can produce images that are good representations of the three-dimensional shape of the sample.

However, the benefits that can be gained through espionage are generally great enough that most governments and many large corporations make use of it to varying degrees.

However, Capra remembers the ship's arrival into New York Harbor, where he saw " a statue of a great lady, taller than a church steeple, holding a torch above the land we were about to enter ".

However, the English one underwent a great upward mobility during the Middle Ages, becoming associated with the aristocracy, while its German equivalent retained the humble meaning of " servant ".