New words：

troublesome ['trʌblsəm] adj.令人烦恼的；讨厌的；令人痛苦的；困难的；棘手的

Sample Sentences：

This naughty boy is really troublesome.
He needed surgery to cure a troublesome back injury.
The traffic jam has become a very troublesome issue of human life.

issue ['iʃju:] n. 问题；争论点；发布

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