请用上面所学关于“请求解释”和“给与解释”的句式替换横线部分内容,以语音形式作答。 e.g. A: My younger sister is such a couch potato on weekends! B: What do you mean by couch potato? A: Well. What I mean is that my younger sister spends a lot of time sitting and watching television on weekends. B: Oh, I see.