Parents may find that a troublesome teenager becomes unmanageable.是什么意思？

Parents may find that a troublesome teenager becomes unmanageable.

父母会发现令人头疼的青少年变得难以管教。

parents

n. 双亲（ parent的名词复数 ）；

例句
Some parents believe a boy must learn to stand up and fight like a man.
有些父母认为男孩子必须学会像男子汉一样顶天立地，勇于抗争。

May

aux. 可以，也许，会，但愿；n. [May]五月，山楂属植物，（五朔节装饰用的）绿枝花枝，（春天开花的）绣线菊属植物；

例句
The way that American history is taught may change in order to accommodate some more of those cultures.
美国历史的授课方式可能会为了照顾到更多的文化而作改变。

find

v. 发现，找到，查明，发觉；n. 发现物，被发现的人；

例句
There are many people who still find the act of abortion abhorrent.
仍有很多人对堕胎行为表示厌恶。

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

troublesome

adj. 令人讨厌的，令人烦恼的，引起麻烦的，（孩子等）难管的；

例句
The unity of our society is threatened by troublesome and restless minorities...
我们社会的团结遭到了一小撮滋扰生事、不安分守己的群体的威胁。

teenager

n. 十几岁的青少年，十三岁到十九岁的少年；

例句
As a teenager she formed a strong attachment to one of her teachers...
少女时代的她曾迷上了自己的一个老师。

becomes

v. 变为，成为( become的第三人称单数 )，适合，使（人）显得漂亮，使好看；

例句
...a writer who becomes involved in a real murder mystery through his acquaintance with a police officer...
因为认识一位警官而参与到一件真实谋杀悬案调查的作家

unmanageable

adj. 难管理的，难处理的，难操纵的，处理不了的；

例句
People were visiting the house every day, sometimes in unmanageable numbers.
每天都有人来参观那栋房子，有时人多得都无法控制。