string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%9F%E7%B2%89%E8%B7%9F%E6%B7%80%E7%B2%89%E6%98%AF%E4%B8%80%E6%A0%B7%E7%9A%84%E5%98%9B => Failed to connect to 14.18.117.71 port 38069: Connection refused"
生粉跟淀粉是一样的嘛
