His only connection to the outside world was an air tube and a bell.

僧人与外界唯一的联系就只通过通气管与铃声。

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One point of concentration is where the air tube and bronchus divides.

集中的一点是气管和支气管分叉的地方。

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His only connection to the outside world was an air tube and a bell. Each day he rang a bell to let those outside know that he was still alive.

墓内的僧人和外界的一切联系只有一根输气管和一个铃铛，每天僧人都会摇铃使外面人知其还活着。

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Warm air rising from below causes the wind tube to reach toward the ground.

VOA: special.2010.05.11

A tornado is a violently turning tube of air suspended from a thick cloud.

VOA: special.2009.06.09

The vibrations of the lips, focused and amplified by the mouthpiece and directed into the tube, cause the column of air inside the tube to vibrate, and as in all wind instruments, the vibrating air column produces the sound of the instrument.

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The truly nasty fluttering of the gills was achieved by another man, out of shot, pumping air through a tube into bladders on Mr Chapman's dorsal fin.

ECONOMIST: The Creature from the Black Lagoon

The closest she could come was a memory of snorkeling, trying to draw in air from a plastic tube clogged with seaweed.

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