Ifyouseesomeonedrown的精選

問題詳情：Ifyouseesomeonedrowning,speedisveryimportant.Onceyougethimoutofthewater,ifheisn’tbrathing,youhavefourminutesbeforehisbrainiscompletelydestroyed.Supporthisneck,movehisheadbackandpresshischinup...