奥拉夫买了几台机器，它们能做许多从前用手工做的事。
Olaf has bought several machines which do many of the things formerly done by hand.
如果这数百万个运算用手工做的话，等到完成时，已变得毫无实用价值。
The millions of calculations involved, had they done by hand, would have lost all practical value by the time they were finished.
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.
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