Focus

How our body deals with overexposure to heat

作者：21ST

Brain:Feeling dizzy in hot weather is a sign that the brain is not getting enough oxygen, because blood has been diverted to expand near-skin blood *vessels in order to cool down.

点击阅读全文

对本期电子报订户、有效期内的VIP教师会员和本学期二十一世纪英文报尊享卡用户，我们开放所有内容：
如果您拥有以上权限，请点这里登录；
订阅电子报，请点这里；
激活VIP教师卡，请点这里；
激活21英语尊享卡，请点这里。