那次,是我第一次一个人坐公交车。可我身上没有零钱,只有一张20元的纸币,而那辆公交车是无人售票车,我只好向周围的人换零钱。可是那些大人要么不理我,要么身上也没有这么多零钱。哎!这下可怎么办呢?在一个停靠站,忽然上来一个大姐姐。只见她鹅蛋型的脸上带着微笑,露出两个小小的酒窝,甜甜的,让人一看就很想亲近。我对自己说,她一定是我的救星。于是,我大步向她走去,问她:“大姐姐,我可以用20元和你换一些零钱吗?” That was my first time by bus. But I did not change, only one 20 yuan banknotes, and that bus is unmanned car, I had no choice but to change around people. But those adults either ignore me, or who do not have so much change. Hey! What can be done under this? In a stop, suddenly a big sister. I saw her goose egg-shaped face with a smile, revealing two small dimples, sweet, people would like to see very close. I said to myself, she must be my savior. So, I strode to her and asked her: “Big sister, I can use 20 yuan and you change some change it? ”