It will never be known how and when this numeration ability developed, but it is certain that numeration was well developed by the time humans had formed even semi-permanent settlements.
我们永远也不会知道这种计算能力是何时、如何发展起来的，但可以肯定的是，在人类形成半永久定居点的时候，这种计数法已经发展得很好了。
She stayed to cheer them up before she went on looking for a home that had never known sadness.
她留下来鼓励他们振作起来，然后继续寻找一个从未有过悲伤的家。
His father, Zhuang said, had not known that he would never see his homeland again when they left Nanjing in 1948.
庄灵说，他的父亲在1948年离开南京时，还不知道他将永远也不能再见到故乡。
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