string(311) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%88%91%E5%9B%BD%E5%85%AC%E5%85%83%E5%89%8D%E5%90%8E%E7%9A%84%E5%88%92%E5%88%86%E6%98%AF%E4%BB%A5%E4%BB%80%E4%B9%88%E4%B8%BA%E6%A0%87%E5%87%86 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
我国公元前后的划分是以什么为标准
