catch sb. on the hop 使某人措手不及对话：A: It's a great pity he left suddenly.A：他突然走了，真叫人遗憾。B: Yeah, He caught us on the hop.B：是啊，真让我们措手不及。A: He has lost a good chance to understand others.A：他失去了一次了解他人的好机会。B: Perhaps you're right.B：也许你是对的。chat up with 与……搭讪上对话：A: Henry is chatting up with the pretty girl.A：亨利和那个漂亮姑娘搭上话了。B: He's always popular among girls.B：他总是很受女孩子的青睐。A: Perhaps because he's very handsome.A：也许因为他很帅吧。B: Not exactly. I guess it's what some people call"charisma".B：不完全是，我看这就是人们所说的“超凡的魅力”了。
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