VOA慢速英语:US Could Become an Energy Exporting Country

1. effective adj. 有效的; 起作用的; 实际的
例句：The project looks at how we could be more effective in encouraging students to enter teacher training
该项目着眼于我们如何能够更加有效地鼓励学生参与教师培训。

2. increase vt. 增加，增大，增多
例句：The population continues to increase
人口继续增长。

3. drill vt.训练; 操练
例句：He drilled into the wall of Lili's bedroom
他在莉莉卧室的墙上钻了个孔。

4. suspend vt.暂停; 悬; 挂
例句：The union suspended strike action this week
这周工会暂停了罢工。

5. expand vt. 扩张; 使…变大
例句：Engineers noticed that the pipes were not expanding as expected
工程师注意到管道并没有如预期那样膨胀。