It may not be the most stylish fashion accessory, but a bottle of water sure can come in handy. Despite the fact that no one really knows how much water we need to drink, the reality is that our bodies are composed primarily of water. We need water to lubricate our joints and maintain our muscles. Even mild dehydration can greatly reduce physical performance and will predispose muscles to injury. By carrying a water bottle with you, you'll never go thirsty again。

　　4. 隨身帶水隨時喝

　　一瓶水其實還是很好隨身帶著的，雖然算不上什么時尚配飾來著。身體總是需要很多水分，用來潤滑肌肉和關節。中度的缺水就會使得身體機能下降，造成肌肉損傷哦。

來源:可可英語 http://www.ccdyzl.cn/read/201012/120771.shtml