We observed the reaction using soda ash in a chemistry experiment.

The octopus wiring in this room is dangerous.

He admitted defeat.

I prefer to use natural cosmetics.

He is exactly in the state of 'A frog in a well does not know the vast ocean.'

This project is difficult, and the proverb 'highly-skilled men are the first to be exhausted' applies.

He checked whether he remembered or not.

Cyclooctane plays an important role in organic chemistry.

He took out a book from the bookshelf at the back of the room.

This garden was nurtured using plenty of manure.