He encountered the enemy on the battlefield.

He moved agilely to avoid the enemy bullets.

The enemy aircraft invaded our airspace.

We are ready to invade enemy territory.

We are conducting training to devise strategies against hypothetical enemies.

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

She is attending a self-defense class.

He is known as an expert in the practice of law.

An abnormality was found in the preoperative examination.

Using mnemonics, it became easier to remember new words.