今天Larry和Li Hua一起听了有关环境保护的讲座，但对一些理论，Larry并不接受。

(college hallway noise)

LH: 哎，Larry, 听了这个讲座，我觉得"全球变暖问题"真挺让人担心的。

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: 你说你不买什么？ 哎，没人想卖你东西啊？

LL: I said that I don't buy that theory. That mean's I don't accept it as completely true.

LH: 噢，原来I don't buy the theory就是"我不接受这种说法"。哎，那不就是我们中文里说的"我不买这一套"吗？得了得了，我没时间跟你争论。哎，你听说了吗，我们今年的学费要涨百分之10呢！学校说他们计划要翻修图书馆。

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，去年学校为了扩建体育馆已经把学费增加了百分之5了。Larry, 那你是不是能够再用I don't buy it 给我举一个和学校没有关系的例子呢？

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: 对，你那个朋友Angela，她老是迟到，而且总有借口。可是我不知道Johnson教授这么厉害，居然还公开说不相信她的话，还批评她是自己要求不严格。哎哟，那多不好意思呀。