Jin is my best friend.

That person is my friend.

He is not only an excellent doctor, but also a wonderful educator.

He is knowledgeable about human affairs.

Choosing a leader for the new project is very important.

In medical classes, we learn about the structure of the human body.

He is suffering from inflammation of the renal pelvis.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

Using the private railway makes commuting very convenient.