phr. It takes very long to make dumplings, which is a little troublesome.
phr. Sorry for troubling you!
phr. I am troubling you so much. So sorry for that.
phr. Every time I come across some trouble, he always comes to my rescue.
phr. It's really troublesome.
phr. be in trouble, have trouble
phr. (with politeness) (I) have troubled you a lot.
phr. Air pollution is a very troublesome thing.
phr. Doing this can help avoid a lot of trouble.
phr. Sorry for troubling you: would you please give me a glass?
phr. to cause trouble to...
phr. But, traveling by yourself is too troublesome.
phr. (I need to) trouble you to ask for leave on my behalf.
phr. (I need to) trouble you to tell me his telephone number.