string(375) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B9%B3%E9%85%B8%E8%8F%8C%E7%9A%84%E7%A7%8D%E5%B1%9E%E4%B8%8D%E5%90%8C%E8%80%8C%E5%B0%86%E5%85%B6%E6%89%80%E4%BA%A7%E7%94%9F%E7%9A%84%E7%BB%86%E8%8F%8C%E7%B4%A0%E5%88%86%E4%B8%BA%E5%93%AA%E5%85%AD%E7%B1%BB => Failed to connect to 125.88.227.171 port 38062: Connection refused"
乳酸菌的种属不同而将其所产生的细菌素分为哪六类
