事实上，做父母的，无论家庭背景如何，无论是双亲家庭、单亲家庭、养父母家庭，还是空巢家庭，都没觉得自己比那些没有子女的人幸福到哪儿去。 这一发现对我们习以为常的观念构成了极大挑战。

In fact, no group of parents—married, single, step or even empty nest—reported significantly greater emotional well-being than people who never had children.

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贫穷常使人丧失全部精神与美德，空袋子是难以直立的。

Poverty often deprives a man of all spirit and virtue; it is hard for an empty bag to stand upright.

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空气钻井是一种钻井工艺，是指利用气体去冷却钻头和把岩屑举升出油井环空，而不是利用更常使用的流体。

A drilling technique whereby gases (typically compressed air or nitrogen) are used to cool the drill bit and lift cuttings out of the wellbore, instead of the more conventional use of liquids.

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