New Words：

activity [æk'tiviti] n. 活动
inactivity [.inæk'tiviti] n.不活动；无活动力；不活跃

Sample Sentences：

The streets were noisy and full of activity.
Do you take part in any activity in your spare time?

Inactivity is a disease of modern man.
MEXICO CITY sprang back to life this week after two weeks of fear and inactivity.

modern ['mɔdən] adj. 现代的, 时髦的
spring [sprɪŋ] v. 跳；跃；蹦

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