但是我只是坐在原地，因为我不知道他在做什么。

But I was just sitting because I don't know what he was doing.

youdao

瑞曼：我不知道他在做什么，可是我想他在骗你。

Roman: I don't know what he's doing but he is lying to you.

youdao

我不知道他在做什么，但是显然这是故事的一部分。

I did not know what he was doing. But apparently it was part of the story.

youdao

I don't know what the dates say, 1916, excuse me, and you can see what he's done.

我不知道具体时间了，1916年，不好意思，你能看到他在做什么了。

麻省理工公开课 - 固态化学导论课程节选