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.

Our boarding gate is A7.

He suddenly appeared in the play.

Back then, I was still a student.

It seems I have misplaced my boarding pass somewhere.

I will board the airplane tomorrow morning.

This is my first time boarding an airplane.

He made a comment that created a stir in the meeting.

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.