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.

He cautioned not to speak ill of others, saying, 'Illness enters by the mouth, and disaster does not come out of it.'

He is truly demonstrating talent that surpasses his master, just as the saying 'the student has surpassed his or her teacher' goes.

He was my student, but now he has become so proficient that it can be said 'the student has surpassed his teacher.'

The People's Democratic Republic of Yemen was once an existing country.

The Lao People's Democratic Republic is located in Southeast Asia.

She was diagnosed with Alice in Wonderland syndrome.

The Socialist Republic of Vietnam is located in Southeast Asia.

My friend came from the People's Democratic Republic of Algeria.

The Federal Democratic Republic of Ethiopia is a country on the African continent.