当儿童死亡率下降时，夫妻终于少生孩子了——但是 这个过渡一般至少要经过一代人。
When childmortality declines, couples eventually have fewer children—but that transitionusually takes a generation at the very least.
一个时代的整个一代人已经过世了难以置信的回忆。
An era of a whole generation has passed away with incredible memories.
在20世纪中，经过不止一代人的努力，中国石油地质学已经建立起来了。
Thanks to the efforts made by generation after generation, the petroleum geology of China has been established in the 20th century.
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