He conducted a thought experiment to solve a problem in physics.

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

Well then, I'm off.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

It is reported that North Korea has conducted another underground nuclear test.

He is an expert in experimental psychology.

He is spending a lot of time on experimental research.

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

He is known as an expert in subcritical nuclear experiments.

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.