This evolution was natural, since there was no sense fleshing out the details of use cases until we figured out whether we'd defined the right use cases to begin with.

这个演进是自然形成的，因为直到断定了是否我们开始定义的用例是正确的，我们才可以为用例进行更为详细的信息添加。

youdao

Now he no longer needs to use his labor to earn an income. Instead, he rents out use of the tractor to the younger workers (who otherwise would have to use their bare hands to till the soil, etc.).

他不需要亲自劳动干活赚钱了，现在，他可以把拖拉机租给其他年轻的农民了。

youdao

When paper turns out to be of no use, the waste paper is collected and retreated in the recycling factory before being put into use again.

当纸是没有用的，收集废纸和撤退前的回收工厂再次被投入使用。

youdao

This is very important,which is why I am doing it: "If we want to know how fast a human being can run, then it is no use to average out the speed of a "good sample" of the population; it is far better to collect Olympic gold medal winners and see how well they can do.

这话非常重要，是我作这个研究的原因：,“如果想知道人类最快能跑多快，那从好的样本中测出平均数是“,没用的;,而应该收集田径类奥运冠军的信息,看他们能跑多快。

哈佛公开课 - 幸福课课程节选

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