本集核心英语单词及例句：

1.entrance (n.)入口，进门
The blast left a crater just outside the school's main entrance.
爆炸在学校正门入口处留下了一个弹坑。

2.sign (n.)标志
Greenhill's teaching methods are a signs of the times.
格林希尔的教学方法是一个时代的标志。

3.share (v.)分享
It's hard to share power.
权力很难分享。

4.prohibit (v.)禁止，阻止
The tourists are prohibited from getting on the island.
旅游者被禁止登上那个小岛。

5.metro (n.)地铁
The metro is efficient and spotlessly clean.
地铁非常快捷，而且一尘不染。

6.dynamite (n.)爆炸物，炸药
Dynamite is a powerful explosive.
炸药是一种强有力的爆炸物。

7.litter (n.)杂物，垃圾
Don't litter the place with wastepaper
不要乱扔废纸。