用“lighter than air”造句大全，lighter than air造句

国语站造句 2.24W

Coral grubbs give off a gas that is lighter than air. This keeps the isles suspended in the sky, but can be a nuisance when attempting to construct buildings.

What thing is lighter than air that any person can hold in a second or in a minute but never in an hour?

An unmanned free balloon shall refer to a freely drifting inflatable object which is driven with no power, is piloted by nobody, is lighter than air, and whose gross mass is more than 4 kilograms.

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用“lighter than air”造句大全，lighter than air造句

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