不同的人对睡眠的需要差异相当大。
The need for sleep varies considerably from person to person.
美国的此项差异相去不远。
我不认为有一些性能差异相当的概念。
I don't think there is some performance difference rather conceptual one.
我不认为有一些性能差异相当的概念。
I don't think there is some performance difference rather conceptual one.
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