This room is so quiet that you can't hear any sound at all.

The water of this river is flowing quietly.

His way of thinking is always fluid, able to flexibly respond to new information.

On cold days, cold water is especially delicious.

We often have picnics by the river on weekends.

We often have picnics by the river on weekends.

We have a picnic by the river every weekend.

The liquidity of this company is very high.

Our company is thinking of a new strategy to increase circulating capital.

Superfluidity is a part of physics, referring to the phenomenon where certain liquids flow without friction.