In this chemical reaction, hydration plays an important role.

Who do you think is the master of that house?

He has the courage to challenge anyone.

We discussed to deepen our mutual understanding.

What is the action of this medicine?

This medicine acts directly on the brain.

He is conducting research on a new energy source.

He is researching about a new energy source.

He is known as a person with learning.

The surface of this table is very smooth.