热天,汗出很多。汗,除了水之外,还含有盐分等物质。大量出汗,不仅带走体内的水分,也带走了盐分。人体内的水分和盐分如果流失过多,不及时补充,就会出现头昏、眼花、疲乏无力,甚至发生手脚抽筋或中暑症状。因此,当大量出汗以后,不能只 Hot day, sweat a lot. Sweat, in addition to water, also contains salts and other substances. A lot of sweating, not only take away the body of water, but also took away the salt. If the body of water and salt loss too much, do not replenish, there will be dizziness, dazzled, tired and weak, and even cramps or heat stroke symptoms. Therefore, after a lot of sweat, not only