Your second question is a hypothetical one, which I cannot answer.

第二个问题是一个假设性问题，我现在无法回答。

youdao

I will give it a certain velocity, which I cannot tell you what that is.

我使它具有速度，我也不知道它多大。

youdao

She's a very good reader and editor, so she can spot things which I cannot.

她是一个很好的读者和编辑，所以她常常能指出一些我看不到的事情。

youdao

The poet herself said: "I never try to lift the words which I cannot hold."

VOA: special.2010.07.18

But we cannot live forever, " which is why I would not live forever."

但是我们无法永远活下去，“所以我不会永远活下去“

耶鲁公开课 - 死亡课程节选

No matter how I look at this issue, I cannot escape being troubled by the fact that we have in place a policy which forces young men and women to lie about who they are in order to defend their fellow citizens."

VOA: special.2010.02.06

Perahia's latest CD is a set of Bach Partitas, which I cannot recommend highly enough.

NPR: Murray Perahia: Bonding With Bach And Chopin

While living at Clear-View I have become more at rest with myself accepted that which I cannot change, helped myself and others in recovery.

BBC: Coming Clean: An addict's diary

This seems to be borne out by a paper in Science last week, which I cannot now verify because it is behind a paywall and I am at home.

FORBES: Earthquakes Ruin GPS and Satnavs