string(276) "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%E5%9C%A8%E8%BF%90%E5%8A%A8%E5%AE%9E%E8%B7%B5%E4%B8%AD%E8%BF%90%E7%94%A8 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
心率储备在运动实践中运用
