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.

He suddenly appeared in the play.

It's too late to make plans on the day, so let's make plans in advance.

Acronyms are a convenient way to convey information briefly.

Back then, I was still a student.

Mr. Tojo is my best friend.

It seems I have misplaced my boarding pass somewhere.

This is my first time boarding an airplane.

I will board the airplane tomorrow morning.

Mr. Tojo is my best friend.