My friend has a problem.

我的朋友有一个问题。

Local pollution is a problem.

当地的污染是个问题。

A problem is something difficult.

问题是困难的事情。

I have a problem with my best friend.

我和我最好的朋友有问题。

Sharing a problem is like cutting it in half.

分享一个问题就像把它减半。

It is very crowded, and rubbish is also a problem.

那里非常拥挤，垃圾也是个问题。

Growing population is a problem all over the world.

人口增长是全世界的问题。

If you have a problem, discuss it with your parents.

如果你有问题，和你的父母讨论。

Act out the conversation to solve a problem between friends.

表演对话解决朋友之间的问题。

She'll try to cheer you up if you have a problem.

如果你有问题，她会试图让你高兴。