My pet tortoise lives a very long life.

We went over the mountain by land.

We decided to travel by land.

His long neck reminds me of a goose's neck.

He enlisted in the army.

The continental shelf plays an important role as a habitat for marine life.

Ken always has a humble attitude.

The six principles for composing Chinese script are called 'Rikusho'.

He went ashore from the ship.

We have a responsibility to protect this world.