And out of it starts growing these little boxes with different browser windows.

开始后你会在不同的浏览器中 看到这些小盒子。

For example, you may need to see three websites at the same time for comparing movie times. Instead of opening three browsers, you can just open new tabs in a single browser window.

比如，为对比电影放映时间，你想同时查看三个网页，你只需在一个浏览器中打开三个标签页即可，而不用打开三个浏览器窗口。