Reason: the greater than sign is > and the less than sign is.

First, the definition of water:

1, the simplest hydroxide, chemical formula H2O. Colorless, odorless and odorless liquid, at standard atmospheric pressure (10 1325 Pa), the freezing point is 0℃, the boiling point is 100℃, and the maximum density is 1 g/ml at 4℃.

2. rivers.

It refers to rivers, lakes, oceans and oceans.

Second, the combination of water:

Hydra, water mill, hydrolysis, hard water

Falling water, drinks, wages, pipes.

Extended data

First, the evolution of etymology:

Second, related words:

1, Shimizu [uncle q and ng]?

Clear cold water.

2. Waterwheel?

Old-fashioned water lifting irrigation tools using human or animal power.

3. In the water?

Under water.

4. cold water?

Water with low temperature.

5. running water?

Water that has a source and often flows.