I cannot understand spending all this money on expensive research.

我无法理解花这么多钱在昂贵的研究上。

I cannot find out if she would like to go with me.

我无法知道她是否愿意和我一起去。

I cannot find my keys.

我找不到我的钥匙。

I cannot deny this fact.

我不能否认这个事实。

I cannot believe his words.

我无法相信他的话。

I cannot bear to see him so sad.

我不忍看他如此伤心。

I cannot tolerate this behavior.

我不能容忍这种行为。

I cannot understand this problem.

我无法理解这个问题。

I cannot wait to see the new movie.

我迫不及待想要看到新电影。

I cannot bear to refuse his request.

我不忍拒绝他的请求。