He is writing a thesis on dialectical materialism.

We should always remember the power of Kannon in difficult times.

He is doing special exercises to strengthen his flexor digitorum profundus.

General relativity is a theory of physics proposed by Einstein.

Special relativity is one of the fundamental theories of physics.

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.