今天Larry和Li Hua一起聽了有關環境保護的講座，但對一些理論，Larry並不接受。
(college hallway noise)
LH: 哎，Larry, 聽了這個講座，我覺得"全球暖化問題"真挺讓人擔心的。
LL: I don’t know, Li Hua... I just don’t buy the theory that global warming is caused by humans. There is a lot we just don’t know.
LH: 你說你不買什麼？ 哎，沒人想賣你東西啊？
LL: I said that I don’t buy that theory. That mean’s I don’t accept it as completely true.
LH: 噢，原來I don’t buy the theory就是"我不接受這種說法"。哎，那不就是我們中文裡說的"我不買這一套"嗎？得了得了，我沒時間跟你爭論。哎，你聽說了嗎，我們今年的`學費要漲百分之10呢！學校說他們計劃要翻修圖書館。
LL: What? That’s ridiculous. I don’t buy that excuse. They raised tuition last year by 5% to expand the stadium.
LH: 就是嘛，去年學校為了擴建體育館已經把學費增加了百分之5了。Larry, 那你是不是能夠再用I don’t buy it 給我舉一個和學校沒有關係的例子呢？
LL: OK. You know my friend Angela? She’s often late for class, and she always has different excuses. So finally one day, Professor Johnson said to her, "I don’t buy your excuses. I think you are just not self-disciplined enough!"
LH: 對，你那個朋友Angela，她老是遲到，而且總有藉口。可是我不知道Johnson教授這麼厲害，居然還公開說不相信她的話，還批評她是自己要求不嚴格。哎喲，那多不好意思呀。
