string(250) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%A7%86%E7%BD%91%E8%86%9C%E5%B1%8F%E5%B9%95%E7%9B%B8%E5%BD%93%E4%BA%8E%E5%87%A0k => Failed to connect to 101.89.159.206 port 38100: Connection refused"
视网膜屏幕相当于几k
