Einstein proposed the theory of relativity.

He is an expert in theoretical physics.

He emphasized his belief by saying, 'I believe in order to understand.'

She described the pain of a broken heart as tears.

I don't know a thing about him.

The philosophy of Mohism, one of the thoughts of ancient China, advocated universal love and fairness.

He fulfilled his responsibilities as a government official.

We must absolutely obey the orders of the emperor.

He was promoted to a high-ranking position.

In mahjong, the opponent on my right, the lower house, is a formidable enemy.