An antiproton is a particle with the same mass as a proton but with opposite charge.

A proton is one of the fundamental components of matter.

Yoko is my best friend.

An antiparticle is a particle that pairs with a matter particle.

Electrons have a negative electric charge.

How much is the mass of this object?

We are in the same class.

He is thinking the same way.

He repeats the same routine every day.

We have the same hobbies.