This medicine promotes the secretion of saliva.

This plant has withered due to lack of water.

The culture of the Korean Peninsula is very unique, and its history dates back to ancient times.

Denji is swimming in the river.

There are many buds on the cherry tree in the garden.

The teacher lead him.

The United Nations Security Council plays a crucial role in maintaining world peace and security.

In chemistry class, I learned about alkanes.

Alkynes play a very important role in organic chemistry.

Alkenes, also known as olefin hydrocarbons, play an important role in organic chemistry.