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。

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.

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如果先前的检查点已经在进行中，由日志切换引起的检查点会覆盖当期的检查点。

If a previous checkpoint is already in progress, the checkpoint forced by the log switch will override the current checkpoint.

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时时检查你的时间安排和现在已经进行中的项目。

Examine every opportunity along the lines of time vs. projects already underway.

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