Last week, I explained some English expressions about clothes. Everything I told you was true. I did not talk through my hat or say something without knowing the facts.
上周，我们解释了一些关于衣服的英语表达。我告诉你的一切都是真的。我可没有吹牛或者胡说八道。
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Knowing this, if the middle man saw a white hat in front of him, he'd know that his own hat was black, and could answer the question correctly.