What is this solid made of?

There are sediments at the bottom of this lake that have accumulated over centuries.

What is this mixture made of?

This structure was built centuries ago.

This is the souvenir I brought back from my trip.

My favorite mode of transportation is the train.

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

I am thinking about what to make her birthday gift.

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

Please wear a helmet in this area as there is a risk of falling objects.