string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%9B%AA%E7%9A%84%E5%BD%A2%E6%88%90%E5%B1%9E%E4%BA%8E%E5%93%AA%E7%A7%8D%E7%89%A9%E6%80%81%E5%8F%98%E5%8C%96 => Failed to connect to 101.89.117.144 port 38056: Connection refused"
雪的形成属于哪种物态变化
