Translation of "Dealing" in Chinese

I am dealing with difficulties.

- 我与困难作斗争。
- 我對付困難。

He is good at dealing with children.

他擅長應付小孩子。

It isn’t done by just dealing with the trash at the end.

这可不是在最后处理垃圾那么简单

Psycho-horror films dealing with the mysteries of human psychology are popular these days.

這幾年有關心理之謎的心理恐怖片很熱門。

- He was careful to mention it in the letter.
- He wrote a letter dealing with the matter in all seriousness.

他写了一封信函认证的讨论了那个事情。

It is clear that the Americans can't even solve their own problems, so how can they possibly think themselves capable of dealing with the rest of the world's problems?

显然，美国人连他们自己的问题都解决不了，所以他们怎么可能认为自己有足够的能力解决其他国家的问题呢？