这能减少在代码中测试生成进程的需要。
This reduces the requirement to test the spawning process in your code.
它会为每个可用处理器单独创建一个生成进程。
A separate build process is created for each available processor.
实际的生成进程本身不会失败，即便您调用的函数不存在也是如此。
The actual spawning process itself will never fail, even if the function that you are calling does not exist.
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