He started a counterattack against the opponent to retaliate.

He did his best to give tit for tat.

Among polyandrous animals, there are species where one female mates with multiple males.

Looking at that person's behavior, I feel like they have some secret.

The police used tear gas against the demonstrators.

Fergus is my best friend.

This factory has significantly reduced its carbon dioxide emissions.

Fougasse is one of my favorite types of bread.

We need to replace the gasket of this engine.

He lost consciousness due to the effects of nerve gas.