指要么完成、要么一点也不执行的动作。
Actions which are either carried to completion or not carried out at all.
在绘图工具中，没有错误检查，也不执行任何规则。
In a drawing tool, there is no error checking or enforcement of rules.
这个方法并不建立新处理序或应用程序定义域，也不执行新执行绪上的进入点方法。
This method does not create a new process or application domain, and it does not execute the entry point method on a new thread.
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