string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BF%83%E7%8E%87%E5%82%A8%E5%A4%87%E7%9A%84%E5%85%AC%E5%BC%8F%E4%B8%BA => Failed to connect to 101.89.117.144 port 38056: Connection refused"
心率储备的公式为
