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本集核心英语单词及例句：

1.brief 简短
If you have something to tell me,please make it brief;I have another meeting soon.
你如果有事情告诉我，请说简短一些；我等会儿还有个会要开。

2.to be brief but very important 很简短但是非常重要
I want to tell you something that is brief but very important.
我想要告诉你一件虽然很简短但是很重要的事情。

3.cut down 切断
Please don't cut down trees unless you have to;we need to help save the environment.
除非不得已请你不要砍树，我们必须保护环境。

4.teeth 牙齿
Beaver's teeth are so strong they could probably eat through steel.
海狸的牙齿应到可以把钢铁吃下去。

5.in fact 事实上
I really like learning English at Greenhill;in fact,I love it so much I never want to go home.
我非常喜欢在格林希尔学习英语；事实上，我都爱到不想回家了。

6.foreign 外国
If you learn English well,you can make many exciting foreign friends.
要是你把英文学好的话，你能交到许多有趣的外国朋友。

7.to join someone 参加，参与
Please join us for dinner tomorrow if you have time.
你明天如果有空的话，请到我家来吃饭。

8.busy/occupied/unavailable/not free/tied up/in the middle of something 忙于
Please forgive me,but I am so busy that I do not have time to take care of you.
不好意思，我现在忙到没时间照顾你。