This rock has been here for hundreds of years.

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

This rock has been weathering for centuries.

Due to weathering, the rocks gradually crumble.

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'.

Could you bring me that, whatchamacallit?

What? I couldn't catch what you said.