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。
It's going to be my sort of simple implementation of a progress bar.
它将是一种我的,简单的执行进度条。
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