string(278) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4%E4%B8%AD%E7%BA%A7%E6%95%99%E6%9D%90%E6%9C%89%E7%A7%9F%E8%B5%81%E7%9A%84%E7%AB%A0%E8%8A%82%E5%90%97 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
2021年中级教材有租赁的章节吗
