语音讲解：
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　　【图片背景】

　　Now it is about three o’clock. The woman who is selling sweet potatoes is leaning against her tricycle now, waiting for the next to buy. By the way, she has just had her lunch, which was just a sweet potato. Life is not easy for everyone.

　　【实用词汇】

　　sweet potato 红薯

　　tricycle 三轮车

　　by the way 顺便提一句