孔子周游列国时，被困在陈国和蔡国之间，连续七天得不到粮食，只能吃些没有粮米的野菜。颜回过意不去，便去讨米做饭，饭快熟时，掉进了一些灰尘，颜回想不管它吧，恐不洁净；扔掉它吧，又觉得可惜，也不吉利。于是，颜回一把抓起来就吞吃了。不料，这一举动被孔子无意中发现 When Confucius traveled to other countries, he was trapped between Chen and Cai, leaving no food for seven consecutive days and only eating wild vegetables without grain. Yan back to the destination, then went to discuss rice cooking, cooked fast food, fell into some dust, Yan think back to it, fear not clean; throw it away, but also feel pity, not auspicious. So, Yan Hui grabbed a swallow up. Unexpectedly, this move was accidentally discovered by Confucius