市场上出现一本书《千万别管孩子》，但马上又新出一本《孩子是管出来的》，让家长无所适从。

Appear on the market the book "never leave child", but once again the new "the child is tube out", allowing parents to not know what course to take.

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歌词是在频繁的羽管键琴伴奏下唱出来的。

The lyrics were spoken, frequently to the accompaniment of a harpsichord.

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Or in many kinds of gas refrigerators where you push a gas through a nozzle close to room temperature, what you find is that the gas coming out on the other side under lower pressure is cooler than the gas that went through on the other side.

或者在很多种压缩气体式冰箱中,你让气体通过接近室温的管口,你会发现从压力低的一边,出来的气体比通过,另一边的气体更冷,真正的冰箱实际上通过。

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