string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B8%B8%E7%94%A8%E5%9B%BD%E5%AE%B6%E8%8B%B1%E6%96%87%E7%BC%A9%E5%86%99%E6%9C%89%E5%93%AA%E4%BA%9B => Failed to connect to 101.89.117.144 port 38022: Connection refused"
常用国家英文缩写有哪些
