精通英语的警察

一天，一名警察在巡逻时遇到了一个外国游客，他很友好地走过去，问道：“Hello, sir! Can I help you?”
游客有些懵懂地回答：“Sorry, I don't speak English.”
警察顿时一脸得意地说：“Oh, okay! I can speak many languages, let me try another one. 你好，先生！请问你需要帮助吗？”