string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B1%86%E8%8A%BD%E7%94%9F%E9%95%BF%E9%9C%80%E8%A6%81%E5%93%AA%E4%BA%9B%E5%9B%A0%E7%B4%A0%E5%91%A2 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
豆芽生长需要哪些因素呢
