He is looking for a proving ground to test his new theory.

He conducted a thought experiment to solve a problem in physics.

I found an old box in the storeroom.

He is suffering from combat stress reaction.

She felt the pathos of things when she saw the cherry blossoms falling.

What is this object?

Zoo staff must clean up the animals' excrement every day.

I am thinking about what to make her birthday gift.

This animal is a protected species, so you must never touch it.

The police found an explosive substance at the location.