We had a picnic at the foot of the mountain.

I used a digital recorder to record the content of the meeting.

Europium is one of the rare earth elements.

Polonium is one of the radioactive elements.

Einstein proposed the theory of relativity.

I purchased the goods in euros.

He looked back.

This road is very crowded.

This route leads to the library.

It's difficult to understand the movement of the great stag in shogi.