We can't live without water. Everyone needs to drink water every day. If we don't drink enough clean water, we may be ill. And if our clothes are dirty, we also need water.
离开水我们不能生存。每人每天都需要水。如果不喝足够干净的水，我们就会生病。如果我们的衣服脏了也需要水。

So water is very important. But there isn't enough water in the world now. If we don't save water from now on, in the future we can't see clean water in the world except our own tears.
因此水很重要。可是现在世界上已经没有足够的水了。如果我们不从现在起节约用水，那么将来我们在世界上将看不到干净的水，除了我们自己的泪水。

词义解析：

1.enough：足够的
2.ill：生病的
3.dirty：脏的
4.save：节省
5.except：除了
6.tear：眼泪

词组解析：

from now on：从现在开始