We crossed the river by crossing the pontoon bridge.

We should respect the ancient customs of that region.

He is doing a specialized study in economics.

He is specially studying mathematics.

I found a Japanese clover flower in the park.

Kyoto is known as the ancient capital city.

This song expresses a joyful feeling.

The company fell into decline due to the economic crisis.

Deciduous forests clearly show the change of the four seasons.

I lost contact with him.