VOA慢速英语:Older Populations Are a Fact of Life for Many Countries

1. improve vt. 提高
例句：How to improve your english debate?
如何提高英语辩论水平？

2. expect vt. 期望
例句：Is that too much to expect?
难道这也期望太高？

3. fertility n. 肥沃
例句：As worms move through soil they help to maintain its fertility.
当蚯蚓在土壤中面蠕动时，可帮助保持土壤的肥力。

4. economist n. 经济学家
例句：He is my professor and he is an economist.
他是我的教授，还是一名经济学家。

5. threaten vt. 威胁
例句：How dare you threaten me?
你居然敢威胁我?

6. concern n. 关心
例句：Billie's not your concern anymore.
比利不再是你要关心的了。

7. solve vt. 解决
例句：You can solve the case.
您可以解决的情况。

8. productive adj. 富有成效的
例句：We had a productive meeting that solved some problems.
我们开了一个富有成效的会议解决了一些问题。