string(270) "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%E7%9A%84%E7%89%A9%E7%90%86%E7%8E%B0%E8%B1%A1100%E4%B8%AA%E5%88%9D%E4%B8%AD => Failed to connect to 101.89.159.206 port 38087: Connection refused"
生活中的物理现象100个初中
