New words：

complain [kəm'plein] v. 抱怨；投诉；埋怨；发牢骚

Sample Sentences：

You've got nothing to complain about/of.
He complained that the exam was too hard.
The tourist complained that the room was too dirty.

tourist ['tuərist] n. 游客；旅游者；观光者

标签: none