You'll dehydrate very quickly in this heat if you don't drink lots of water.天这么热，不大量喝水身体很快就会脱水。Exercising in this heat will dehydrate you.在这样的高温下锻炼会使你脱水的。Athletes drink lots of water so they don't dehydrate.运动员喝很多水，这样他们就不会脱水。People can dehydrate in weather like this.人们在这样的天气下可能会脱水。