"Progress" - Integer percent completed indicator, which MUST return 100 only when the operation has been completed (either successfully or unsuccessfully).

“progress”：指示操作的进度，整型数值，当操作完成执行时，不论是成功还是失败，都返回100。

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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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Most guests emerge from the Tucson, AZ, destination spa with increased awareness of their strengths and weaknesses--or, at least, of their fears--with many pledging to return to chart their progress.

FORBES: Magazine Article