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。
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。
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。
Users initiate an undo by shaking the device, which displays an alert that allows users to undo what they just typed, redo previously undone typing, or cancel the undo.
用户摇晃设备启动撤销，接着设备将显示警告，允许用户撤销他们刚刚输入的内容，重做之前撤销的内容，或取消撤销。
A security token that can be cancelled, such as one that is issued, allows a client that requested a security token to cancel it when it is done with it.
可取消的安全性权杖(例如，已核发的安全性权杖)允许要求安全性权杖的用户端在处理完成时取消它。
'Cancel', which allows us to change our mind, and exit the dialog without doing anything at all.
取消如果你改变了主意，可以退出对话框，不作任何改变。
The pulsed drive mode, shown in Figure 1-24, allows the micro - ohmmeter to cancel stray offset voltages in the unknown resistance being measured.
图1 - 24所示的脉冲驱动模式使微欧姆计能够消除被测未知电阻上的寄生偏置电压。
The pulsed drive mode, shown in Figure 1-24, allows the micro - ohmmeter to cancel stray offset voltages in the unknown resistance being measured.
图1 - 24所示的脉冲驱动模式使微欧姆计能够消除被测未知电阻上的寄生偏置电压。
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