An asynchronous method can return a Future object that allows the client to retrieve a result value, check for exceptions, or attempt to cancel an in-progress invocation.

一个异步方法能返回一个Future对象，该对象使得客户端可以获得一个结果值、检查异常或者尝试取消正在进行中的调用。

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CancelRequest — This operation allows the ra to cancel the execution of a pending asynchronous request.

CancelRequest——该操作允许RA取消执行尚未执行的异步请求。

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For a form that allows irreversible operations, such as deletions, it's a good idea to make the Cancel button the default command button.

对于允许进行不可逆操作(如删除)的窗体，最好将“取消”按钮设置为默认命令按钮。

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Same-day streaming pulls in new subscribers, but it also allows those subscribers to cancel one they feel sufficiently steeped in a breakout favorite.

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Dingell argued employers would not cancel health care coverage, and said his plan which allows patients to sue in both state and federal court is the best way to ensure that people get the protections they need.

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