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本集核心英語單詞及例句：

1.brief 簡短
If you have something to tell me,please make it brief;I have another meeting soon.
你如果有事情告訴我，請說簡短一些；我等會兒還有個會要開。

2.to be brief but very important 很簡短但是非常重要
I want to tell you something that is brief but very important.
我想要告訴你一件雖然很簡短但是很重要的事情。

3.cut down 切斷
Please don't cut down trees unless you have to;we need to help save the environment.
除非不得已請你不要砍樹，我們必須保護環境。

4.teeth 牙齒
Beaver's teeth are so strong they could probably eat through steel.
海貍的牙齒應到可以把鋼鐵吃下去。

5.in fact 事實上
I really like learning English at Greenhill;in fact,I love it so much I never want to go home.
我非常喜歡在格林希爾學習英語；事實上，我都愛到不想回家了。

6.foreign 外國
If you learn English well,you can make many exciting foreign friends.
要是你把英文學好的話，你能交到許多有趣的外國朋友。

7.to join someone 參加，參與
Please join us for dinner tomorrow if you have time.
你明天如果有空的話，請到我家來吃飯。

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，我現在忙到沒時間照顧你。