井眼的环空体积为115方。

The annular volume is 115 cubic meters.

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几世纪以来生物学家都知道鸟类的骨头又细又空，但鸟类的骨架并不比相同体积的哺乳动物的轻。

For centuries, biologists have known that bird bones are thin and hollow. Yet bird skeletons don't actually weigh any less than the skeletons of similarly sized mammals.

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乐观者说，有半杯水，悲观者说，杯子的一半是空的，工程师说，杯子太大了，它是它所盛装的，液体体积的两倍。

The optimist says the glass is half full, the pessimist says the glass is half empty, the engineer says that glass is twice as large as it needs to hold the fluid it contains.

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