He sent a message using a straight key.

In Magic: The Gathering, you can place cards in the command zone.

He lost his virginity yesterday.

He lost his virginity last night.

In the professional wrestling match, he executed a backbreaker on his opponent.

I will graduate from university next year.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.