This rain is a harbinger of the typhoon.

He studied all night on the eve of the exam.

He likes to take a walk in the park at dusk.

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.

He is an expert in experimental psychology.

He is spending a lot of time on experimental research.

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

He fulfilled his responsibilities as a government official.