19世纪和20世纪初，人们确信历史遗迹可以为过去提供可靠证明，而在当时，科学被视为客观的和毫无价值的。
The conviction that historical relics provide infallible testimony about the past is rooted in the nineteenth and early twentieth centuries, when science was regarded as objective and value free.
那么，这个速度是怎样被查明的？我们又怎样才能确信它是可靠的？
But how could this have been ascertained? And are we certain that the result is trustworthy?
你如果不试试能否侵入自己的防卫系统，又如何确信它是安全可靠的？
If you don't explore whether you can penetrate your own defenses, how can you know they're secure?
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