string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BE%8E%E5%85%83%E7%9A%84%E6%B6%A8%E5%B9%85%E4%B8%8E%E8%B7%8C%E9%99%8D%E7%8E%87%E7%9A%84%E5%85%B3%E7%B3%BB => Failed to connect to 101.89.117.144 port 38022: Connection refused"
美元的涨幅与跌降率的关系
