This check valve has the role of preventing water from flowing backwards.

The river water is flowing back.

In this river, the counter current is very strong, so caution is necessary.

His role is the team leader.

Please stop the car because it's raining.

This game is easy if you think in reverse.

On cold days, cold water is especially delicious.

It seems that this river is flowing backwards.

You must not go in the reverse direction on this road.

You must not proceed in the reverse direction on this road.