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?
通过使安装具有可回归性，我就可以确信，在任何时候，我都可以可靠地以低廉的代价把我的开发的任何版本安装到某个客户的机器上。
By keeping installation in the regression suite, I'm assured at all times that I can reliably and inexpensively relocate any version of my development to a customer's machine.
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