string(244) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=20kg%E7%9B%B8%E5%BD%93%E4%BA%8E%E5%A4%9A%E5%B0%91%E7%89%9B%E7%9A%84%E5%8A%9B => Failed to connect to 101.89.159.206 port 38087: Connection refused"
20kg相当于多少牛的力
