This transporter is designed to carry luggage efficiently.

This experimental device is used to create new substances.

He is making a Rube Goldberg machine at home.

This display device has a very high resolution.

This input device is very easy to use.

His ears are very good, so he can hear distant sounds.

The first time I heard his name was at that party.

Recently, my tinnitus has been so bad that I decided to see a doctor.

I take classes every day.

Please tell me the singular form of this word.