string(366) "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%E4%B8%80%E5%AE%9A%E8%8C%83%E5%9B%B4%E5%86%85%E9%9A%8F%E7%9D%80%E8%AE%AD%E7%BB%83%E7%A8%8B%E5%BA%A6%E7%9A%84%E6%8F%90%E9%AB%98%E8%80%8C%E5%A2%9E%E5%A4%A7 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
心率储备在一定范围内随着训练程度的提高而增大
