The Second International was established to protect the rights of workers.

He is learning how to use the second adjective.

Please compare this apple and that orange.

This is my first attempt.

His actions change depending on the circumstances.

His first choice of school is the University of Tokyo.

She was going through puberty and was confused by the changes in her body.

His poetry is rich in metaphors, and there are new discoveries every time I read it.

The volume ratio of this engine is 10:1.

He started calculating to obtain the ratio of the two numbers.