截至周日中午，甘肃山地马拉松越野比赛已确认极端天气导致21人遇难，搜救工作告一段落。请看本报昨日的报道：

Lasting almost 24 hours, rescue work came to an end after extreme weather killed 21 during a 100-km cross-country mountain marathon race in Baiyin City, Northwest China’s Gansu Province, the local rescue headquarters said Sunday.

By Sunday noon, the remains of all 21 victims had been transferred from the incident site, said the rescue headquarters.

According to the rescue headquarters, at about 1 p.m. Saturday, hail, freezing rain and gales hit the area of the race’s high-altitude section, between 20 km and 31 km. The dead participants suffered from physical discomfort and hypothermia due to the sudden drop in air temperature.

报道中的hypothermia是“失温”，指体温低于35摄氏度引发的严重身体反应。例如：

Hypothermia is a medical emergency that occurs when your body loses heat faster than it can produce heat, causing a dangerously low body temperature. Your heart, nervous system and other organs can’t work normally.

失温是一种急症，指身体失去的热量快于能产生的热量，从而导致危险的低体温状态。人的心脏、神经系统和其他器官无法正常工作。