要想执行手工优化，必须了解底层处理器体系结构，从而充分地了解应该如何重构代码才能在给定的硬件平台上实现良好的性能。
To perform hand optimization, you must understand the underlying processor architecture to fully understand how the code should be restructured to perform well on a given hardware platform.
当手工转换文件时，我们通常使用两个或三个经过良好测试的样式表。
When converting files manually, we often work with two or three well-tested style sheets.
手工安装时，密封带有良好的抗撕性能。
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