We understand that teamplay is necessary for us to succeed.

Where are you going?

He is very happy inside.

He will succeed soon.

The interior of this room is very beautiful.

They are my best friends.

I learned how to calculate the harmonic mean in math class.

The harmonic series continues indefinitely, but its sum is not finite.

Vowel harmony plays an important role in the phonology of certain languages.

He is an expert in harmonic analysis.