除非有确凿的考古证据支持，否则我们应谨慎对待给出的迁徙日期。
Dates given for the migrations should nevertheless be treated with caution, except where supported by hard archaeological evidence.
除非你是难以置信的愤世嫉俗，否则你将会相信如果你乐观对待在做的事情，那么一定会有一个积极的影响。
Unless you are incredibly cynical about what you do, you’ve got to believe that you have positive impact if you are going to be optimistic about what you do.
即使你觉得你好像受到不公平的批评或对待，也不要把事情公开，除非是被迫如此。
Even if you feel as if you're being unfairly targeted or treated poorly, don't take the matter public unless you're forced to.
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