伤脑筋的英文：
knotty
troublesome
bothersome

参考例句：

It is annoying that there is no hot water.
没热水,真伤脑筋。

That's quite a poser!
那事真伤脑筋!

It's rather troublesome.
这事真伤脑筋。

It 's a pain in the neck trying to choose the right year - end gift.
选择合适的年礼真是件伤脑筋的事

He chewed over a vexatious problem of personnel.
他思考着伤脑筋的人事问题。

There is more trouble in having nothing to do than in having much to do
无事可做比有许多事要做更伤脑筋

What a bunch of headache!
真够伤脑筋的！

Her child is a trial to his teachers.
她的孩子让老师很伤脑筋.

That's quite a poser!
那事真伤脑筋！

The naughty kid is a trial to his teachers.
这个淘气的孩子让老师很伤脑筋。

knotty是什么意思：
a. 有结的，多节的，多瘤的，棘手的

The trainee foxed the arrogant instructor with a knotty problem.
那位受训的队员故意用难题把傲慢的教练搞糊涂。

He tagkles the knotty problem without recourse to any help.
他不依靠任何人的帮助而独立处理这一难题。

He tackle the knotty problem without recourse to any help
他不依靠任何人的帮助而独立处理这一难题

troublesome是什么意思：
adj. 令人烦恼的，麻烦的

It is the first step that costs troublesome
万事开头难

A troublesome child,problem,headache
让人心烦的孩子、问题、头痛

The boss lumbered me with a troublesome job.
老板硬要我干一件麻烦的差事。

bothersome是什么意思：
adj. 麻烦的，令人讨厌的

An obtuse, boring, or bothersome person; a pest.
讨厌的人愚钝的、无聊的或讨厌的人;害人精

Of course, those taps were extremely bothersome.
不过，这样的轻敲肯定是极其恼人的了。

He had never understood why people should worry about all these bothersome foreign affairs
他从来没有想到为什么人们竟然为了这些讨厌的外交事务而操心。