This function is very useful, but also very badly named.
这个函数十分有用，但是它的命名非常糟糕。
This activity is very useful if you need to provide a cancellation function in your process.
如果您必须在流程中提供取消功能，那么该活动将非常有用。
This function is very useful in situation like a group of soldier that runs in a battle.
这一个功能是非常有用的在同类情形中一群军人以在一场战争中跑。
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