string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E6%A0%B7%E6%8F%90%E9%AB%98%E8%80%90%E5%8A%9B%E5%92%8C%E6%8C%81%E4%B9%85%E5%8A%9B => Failed to connect to 101.89.159.206 port 38075: Connection refused"
怎样提高耐力和持久力
