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）。

youdao

The former renders a progress bar.

前者显示一个进度条。

youdao

Then select Add a progress bar.

然后，选择add a progress bar。

youdao

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

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。

哈佛公开课 - 计算机科学课程节选

PROFESSOR: So, does anyone have any questions about the set up here, does it make sense what we're looking for the bar to go back once we make some progress.

教授：所以，有人对这套装置,有疑问吗，一旦我们,取得了一些进展,我们看到这个棒又返回来。

麻省理工公开课 - 化学原理课程节选

You'll also notice a small dotted progress bar for a quick measure of how far you've read.

ENGADGET: Amazon Kindle Paperwhite review

The progress bar at the bottom said I was ninety-one per cent done.

NEWYORKER: A New Page

Can you imagine installing a large software application on your computer without seeing a progress bar showing you its completion percentage?

FORBES: A New Way Forward: The Better Way to Accelerate Change