他常常是连续几周不见人影。

He would disappear for weeks on end.

《牛津词典》

你看不见人，街道上空空如也。

You do not see people - it is like empty streets.

youdao

街道上已是空落落的，几乎不见人影。

The street was empty, and there was scarcely anyone to be seen.

youdao

Can anyone not see it? Does anyone need -- actually I can't even tell if you raise your hand. So ask your neighbor if you can't see it and get one of the plates if you're having trouble seeing with the glasses. So this should match up with the spectrum that we saw.

有人没看到的吗？,有人需要-实际上你们举手我也看不见,看不到的话就问你们周围的人借个小片,如果你们用眼镜看不到的话,这应该和我们看到的光谱是吻合的。

麻省理工公开课 - 化学原理课程节选

And you know, sometimes you run into people that you haven't seen in a while, so it's nice.

你知道，有时候你碰上一些好久不见的人，这很好。

有趣的宿舍生活 - SpeakingMax英语口语达人