string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%9F%E6%B4%BB%E4%B8%AD%E6%9C%89%E5%93%AA%E4%BA%9B%E7%89%A9%E7%90%86%E7%8E%B0%E8%B1%A1 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
生活中有哪些物理现象
