We must drink water everyday. We can't live without water.

我们每天要喝水。离开水我们不能存活。

Water is very important for us. We must drink water everyday. We can't live without water.

水对我们很重要。我们必须每天喝水。没有水我们就不能生存。

We can't live without water, but now many rivers are polluted.

没有水我们不能生存，但是现在许多河流被污染。