My grandfather is suffering from arthritis.

He is suffering from illness.

My grandfather is healthy and living a long life.

In this ancient document, the character '關', in its old form, is used.

Mr. Guan is my best friend.

He was staring at the flame.

He clenched his hand until his knuckles turned white.

I go jogging every day.

The nodes of this tree are distinctive, aren't they?

Christmas is an important occasion when the family gathers.