We can see that it looks like a button, but how do we know what it will accomplish when we press it?

我们看到一个按钮样的东西，但如何才能知道当它被按下时能完成哪些任务？

youdao

We can see that it looks like a button, but how do we know what it will accomplish when we press it?

我们看到一个按钮样的东西，但如何才能知道当它被按下时能完成哪些任务？

youdao