In mathematics, equivalence classes are a very important concept.

Polychaete worms play an important role in the seabed ecosystem.

This is a towel for customers.

My ear hurts because it's clogged with earwax.

I use an earpick to clean my ears every day.

He used the technique of ear copying to create a new song.

His music is like ear rape.

She was wearing new earrings.

He learned English by rote.

Considering his social status, he received special treatment.