He is a famous camera geek, always carrying a camera around.

Please keep this information off the record.

Isaac is an important figure in the Bible.

He is really a moody person, his attitude changes many times in a day.

We found that this equation has an imaginary root.

We will use rare gases in this experiment.

The Chimera is a monster from Greek mythology.

He was disheartened because he failed the exam.

Tsukiko is my best friend.

Yuko is my best friend.