He turned over in bed several times while sleeping.

He couldn't sleep, turning over in bed repeatedly.

An antiquark is the antiparticle of a quark.

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

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

He was expelled from the party because he took anti-party actions.

He is known as an anti-war activist.

He likes to take a walk in the park at dusk.

Linear programming is a part of operations research and is used to find the optimal solution.

Paying the urban planning tax is a citizen's duty.