His shout echoed far away.

He asked in a trembling voice, 'Do you really think so?'

She suddenly let out a scream, startling everyone.

His vulgar and thick voice echoed throughout the room.

It's hard to talk with a hoarse voice from a cold.

He is being criticized as a loudmouth.

He is good at singing songs in head voice.

In chemistry class, I learned about acid anhydride.

What is the imaginary part of this complex number?

What is the real part of this complex number?