第一个答案是，我们先试试观察它的图像。

So, the first answer will be, we can try to look at it's graph.

youdao

他做了一个透明的墙，可以透过它观察里面发生的事情。

He built a transparent wall through which he could observe what went on inside.

youdao

他做了一个透明的墙，可以透过它观察里面发生的事情。

He built a transparent wall through which he could observe what went on inside.

youdao