And if it really does not, then why does it appear to?
如果真相并非如此,那为什么它看上去似乎如此呢?
In our implementation we are using default implementation, which is why it does not appear in the code.
在我们的实现中,我们使用的是默认的实现,这样就是为什么没有在代码中展现的原因。
All this is no doubt true, but it does not explain why Americans are fatter than people in other rich countries, nor why they appear to have stopped getting fatter.
所有的这些无疑都是有道理的,但是他既没有解释为什么美国人比其他发达国家的人更胖,也没能解释为何美国人近来停止发胖。
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