(1) 麻烦;烦恼;烦心的事 (可数，不可数)
It is a pity to give you so much trouble. / Life is full of troubles.
(2) 困难;费事 (不可数)
have trouble with sth. / have trouble (in) doing sth. (= difficulty)
Did you have much trouble in finding the post office? / I hope you won't have any trouble with the work.
(1) ask for trouble 自寻烦恼;自找麻烦
What made you write such a letter? It was asking for trouble.
(2) (be) in trouble 有烦事;有困难;出事;惹麻烦
He never came except when he was in trouble.
(3) put sb. to trouble 给某人造成麻烦;增添麻烦
I am sorry for putting you to so much trouble.
(4) take trouble to do sth. 费心做某事;费心
It was good of you to take the trouble to help us.