语音讲解：
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　　【图片背景】

　　In each city, there are two groups of people. One group are the rubbish pickers. They collect the rubbish and sell them to the recycling center. The other group are those street cleaners. They usually get up at early hours and clean the road before the dawn comes. They have also contributed their effort to the beauty of the city. Thanks you!

　　【实用词汇】

　　rubbish pickers　捡垃圾的人

　　collect the rubbish　捡垃圾

　　recycling center　废品回收站

　　street cleaners　扫大街的人