刘姑娘在菜市场摆摊卖黄鳝、泥鳅。因是刚来,加上卖水产品的摊子较多,她的生意很清淡,有时连本都保不住。一天,她看到墙上一则新贴的广告:出售革胡子鲶苗,随赠饲养技术及育鱼生长素。她很受启发:卖鱼苗的人能为养鱼的人提供方便,我卖黄鳝、泥鳅为什么不给吃的人提供方便呢? Liu girl stalls in the vegetable market to sell yellow trout and loach. Due to the recent arrival and the large number of stalls for selling aquatic products, her business was very light and sometimes she could not keep it. One day, she saw a new ad posted on the wall: sale of leather beard seedlings, along with gifting technology and fish growth hormone. She is very inspired: people who sell fry can provide convenience for fish farmers. Why do I not sell yellow trout and loach to people who eat it?