阅读短文，翻译划线部分的句子。（共5小题，计 10分 ）
One day I happened to meet an Englishman in the street and soon we began to talk. As I was talking about how I was studying English,the foreigner seemed to be very surprised, gently shaking his head and saying "You don't say!" I was puzzled, and I thought, "Perhaps this is not a right thing to talk about." So I said to him. "Well, shall we talk about the Great Wall? Have you ever been there?"
"Certainly! Everyone at home will laugh at me if I leave here without seeing it. The Great Wall is wonderful!" "Yes,它是世界奇迹之一。And people of many countries have come to visit it." As I went on more about it, he stopped me again, "You don't say!"
I couldn't help asking, "Why do you ask me not to talk about it?" "Well, I don't ask you to do so," he answered, greatly surprised. "Didn't you say 'You don't say'?" I asked again. Hearing this, the foreigner laughed loudly. He began to explain, " 'You don't say!' means 'Really?'. Perhaps you know little about English idioms (习语) ."
Wow! 我多么笨啊！Since then I began to learn more English idioms.