Octacosane is a compound often used in organic chemistry.

I have visited Shanhai Pass.

Liquid oxygen is often used as rocket fuel.

Computational geometry is an important field of computer science.

He is working on his job with intense concentration.

He is an expert in electronic phototypesetting.

He is creating a newspaper using an electronic phototypesetter.

He is training his triceps brachii muscle every day.

He is said to have an interest in Communism.

He goes to the gym every day to train his triceps surae muscle.