He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

He is an expert in orthoepy, teaching pronunciation.

Computational geometry is an important field of computer science.

I am learning the basic concepts of differential geometry.

Projective geometry is a branch of mathematics that studies geometric objects such as points, lines, and planes and their relationships.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He is an expert in computational linguistics and is involved in the development of artificial intelligence.

He deeply believes in the principles of national socialism.

He explained the importance of studying while young, saying 'If you do not study when you are young, it will be difficult to learn when you are old.'