Phenol plays an important role in chemical reactions.

Mr. Feng is my best friend.

The pollen of this flower may cause allergies.

You have to pick up the dog's feces.

Hmph, that seems interesting, doesn't it?

The Huns once terrified Europe.

You have to pick up the dog's excrement.

The volcano suddenly erupted.

The country has been suffering from internal strife for many years.