He suffers from adrenal cortex insufficiency.

He is suffering from heart disease.

He is ill with a severe cold.

He is suffering from a serious sickness.

The adrenal gland is an important part of our body.

Let's try the new function of this machine.

How does this machine function?

This map is incomplete, not all roads are drawn.

There are still imperfect parts in this plan.

He is my best friend.