I have been to Zhangjiakou.

His words reminded me of the proverb 'good advice may be uncomfortable to hear.'

We will never know if he told the truth, because dead men tell no tales.

By training the orbicularis oris muscle, your expressions become more expressive.

He faltered due to nervousness.

The urban legend of the slit-mouthed woman terrifies children.

His words are always sweet on the surface but venomous underneath.

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.