"These pants are too short!"

Translation: 这条裤子太短了！

[WillMackay123]

Why do you need the le at the end here?

[Delphinine]

Adding on to Mr.rM's post, 太 + Adj. + 了 just happens to be a common fixed pattern in Chinese.

As is the case in this sentence, it usually means "too [adj.]" and carries a complaining tone (though it can also be used positively, e.g., "太好了!").

Here is some further reading on 太...了 if you're interested. :)

[StanleyVon1]

I dont know why either