飞机越大、越重，它移动的空气就越多。

The bigger and heavier the aircraft, the more air it displaces.

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因为二氧化碳比空气要重，纯净的二氧化碳可以使人窒息。

Carbon dioxide in pure form can asphyxiate because it is heavier than air.

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空气对我们十分重要。

Air is of great importance to us.

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空气对我们十分重要。

Air is of great importance to us.

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