The source of this river is at the top of the mountain.

Ryusuke is my best friend.

The muddy stream hit the town.

A lot of driftwood was washed up on the beach.

In this experiment, we will observe the behavior of α particles.

The train suddenly stopped.

The bus stopped in front of the station.

The liquidity of this company is very high.

He drifted all night at sea.

His boat was drifting at sea.