Surfing the Internet is fun, but it's also a time waster.

上网很有趣，但也是一件浪费时间的事。

This can be a time waster.

这样就会浪费时间。

HUGE time waster.

太浪费时间啦。

But I think it is a pest and a time waster.

但是我认为它是一个有害之物和一个次铸损。

Trying to solve them is the greatest time waster one can engage in.

试着去解决这种问题的人是世界上最浪费时间的人。