He put on his helmet and headed for the battlefield.

He was wearing a helmet like an ancient warrior.

He got a new helmet.

A blackfly landed on my arm and was sucking blood.

Tachypleus tridentatus is designated as an endangered species in Japan.

I saw a horseshoe crab for the first time.

The horseshoe crab is a creature that has continued to live since ancient times.

We have a responsibility to make this world a better place.

This project requires a full-width improvement.

This project requires a full-width improvement.