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。
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。
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。
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。
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