地铁上,碰到祖孙俩。小女生一上车就看到地上丢弃的纸巾。她问奶奶:这是谁丢的,为什么丢在地上?奶奶反问:“你觉得丢在地上不对吗?”“不可以乱丢垃圾,我们每天坐地铁,要干干净净才可以,我想捡起来。”奶奶说:“可以捡起来,但是等我们要下车再捡,然后用新纸巾包起来丢到垃圾桶。”终 Subway, met the grandchildren. The little girl saw the discarded tissue on the ground as soon as she got in the car. She asked my grandmother: Who lost this, why lost on the ground? Grandma asked: “Do you think lost on the ground right? ” “Can not litter, we take the subway every day, to be clean before they can, I want to pick it up. ”“ Grandma said: ”can pick it up, but wait for us to get off and pick it up and then wrap it in a new tissue and throw it in the trash."