This sentence comes from Liu Yiqing's Ode to Snow in the Southern and Northern Dynasties. In this poem, Dr. Xie gathered in a cold snowy day and told his children the significance of the paper. Suddenly, it was snowing heavily, and Xie Daowen chanted, "If catkins were not blown by the wind," this poem used catkins to describe the scene of snowflakes flying and vividly described the beauty of snowflakes. This allusion later became a common word to praise talented women, and it was also widely quoted and praised.