This rock has been here for hundreds of years.

The 20th century was marked by significant advancements in science and technology.

Due to weathering, the rocks gradually crumble.

This rock has been weathering for centuries.

This is an important invention of the 20th century.

This old box contains many cotton flowers made by people in the past.

It's surprising that he can run so fast.

I commute to work every day on a ferry named 'Wataru'.

What? I couldn't catch what you said.

Could you bring me that, whatchamacallit?