这样做的主要原因是基础实现和指令在C语言的声明中可以包装为一个大的switch表达式，如果使用手工的方式来完成无疑将会是非常痛苦的。
One of the primary reasons for this is primitives and instructions are wrapped in a huge switch statement in C, which is a pain to maintain by hand.
如果成千上万的计算全用手工来做的话，等做完的时候，其实用价值也就不存在了。
The millions of calculations involved, had they been done by hand, could have lost all practical value by the time they were finished.
如果成千上万的计算全用手工来做的话，等做完的时候，其实用价值也就不存在了。
The millions of calculations involved, had they been done by hand, could have lost all practical value by the time they were finished.
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