Everyday we eat and drink, and drinking water is the most important. The human body can go without food for a long time, but we need lots of water everyday.
Many people don’t understand how much water the human body needs. They don’t drink enough water because most people drink when they feel thirsty, but we still need to drink even when we are not thirsty. And we always need to drink a lot of water when we play sports.
A person’s body is 65 to 70 percent water. If we don’t have enough water, we may feel tired and become ill.

important [ɪm'pɔrtnt]：重要的
enough [ɪ'nʌf]：足够
thirsty ['θɝsti]：渴的
ill [ɪl]：生病的
play sports ：做运动