string(282) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8F%91%E7%8E%B0%E7%94%9F%E6%B4%BB%E4%B8%AD%E7%9A%84%E7%89%A9%E7%90%86%E7%8E%B0%E8%B1%A1%E6%89%8B%E6%8A%84%E6%8A%A5 => Failed to connect to 14.18.46.51 port 38206: Connection refused"
发现生活中的物理现象手抄报
