如果你在相当长的一段时间内获得的回报比投入少，那么，赶紧撤退。
If you are getting less back than you put in over a considerable period of time, back off.
例如，在某些区域，我们了解到，疟疾负担实际上比相当长一段时间里所假设的要少很多。
In some areas, for example, we are learning that the malaria burden is actually much lower than has long been presumed.
由于是重复使用同一段同步代码，而不是创建自己的同步代码，因此出现的错误会少一些。
Because you are using the same synchronization code over and over, instead of creating your own, you have fewer bugs.
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