This compound is an organic chemical called pentacosane.

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.

His new project meets all three important requirements: funding, personnel, and ideas.

He is training his triceps brachii muscle every day.