string(249) "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%83%BD%E4%BB%A3%E6%9B%BF%E6%B7%80%E7%B2%89%E7%94%A8%E5%90%97 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
生粉能代替淀粉用吗
