Just because a bird does not breed one year, it does not follow that it will fail the next.
不能仅仅因为鸟一年没有繁殖就推断它下一年也不会繁殖。
It does not necessarily follow that if you know few of your neighbors you will know no one else.
如果你认识的邻居很少,这并不一定意味着你不认识其他任何人。
You're not always going to have step-by-step instructions or a model to follow that will tell you how to deal with it.
你并不总是会有一步一步的指导或者告诉你如何处理它、你可以跟着做的模型。
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