While a thread is running, either uploading or downloading, you can query it to check on its status to provide the user with feedback (e.g. a progress bar).

当一个线程在运行的时候，不管是上传还是下载，你可以查询进程状态并且给用户一个反馈（例如一个进度条）。

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The status message section in the editor also includes a progress bar that gives an estimate of the time left to complete command deployment.

编辑器中的状态消息部分还包括一个进度栏，用于估算完成命令部署的剩余时间。

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When the status bar appears, test execution begins and a Progress Summary is displayed.

当状态栏出现时，测试执行操作会开始，而Progress Summary会显示出来。

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A progress bar is not supposed to print one hundred lines just to update its status; generally we like to see a little animation.

一个进度条不应该是打印100行,只是更新它的状态，一般地，我们,想看到一点生机。

哈佛公开课 - 计算机科学课程节选