Messenger is an interface that XM uses to report progress and errors to the user.

Messenger是一个接口，XM用它来向用户报告进度和错误。

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Progress can be used to implement a progress bar or another mechanism to report progress to the user.

progress可以用来实现进度栏或另一种向用户报告进度的机制。

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Progress can be used to implement a progress bar or another mechanism to report progress to the user.

progress可以用来实现进度栏或另一种向用户报告进度的机制。

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