走在放学回家的路上,我经常可以在大街小巷一些偏静处的墙壁上看到这样的告示:此处禁倒垃圾。但颇具讽刺色彩的是,往往就在这个告示下面,堆满了臭气熏天,污水横流的垃圾,特别是在夏天,还能看得见苍蝇在上面翩翩起舞。我也悄悄观察过,倒垃圾的不只有大人小孩,连过路的行人也随手把垃圾扔在那。公正地说,大部分市民还是讲究卫生的。要不大家怎么会把自个儿家里打扫得一尘不染,将垃圾一袋又一袋地提出来扔掉呢?他们也知道需要一个 Walking on the way home from school, I often see signs on some of the quiet walls of the streets where the rubbish is forbidden. Ironically, however, it is often under this sign that there is a pile of stench and sewage trash, especially in the summer where the flies can be seen dancing. I have also quietly observed that it is not only adults and children who bring garbage but also pedestrians who are passing by. To be fair, most citizens still pay attention to hygiene. Why would not everyone clean up their own home spotlessly, put out bags of rubbish and throw it away? They also knew they needed a