These vectors are orthogonal.

These lines intersect orthogonally.

He has a collection of old banknotes.

Spectroscopy is an important means of investigating the properties of matter.

Japan is a constitutional state, and all people are equal under the law.

Looking at the population pyramid, you can see that this country is aging.

You shouldn't tell him secrets because he has a loose tongue.

On nights when the moon shines brightly, I feel special.

Reading is an essential activity in college life.

He always strives for consistency in his words and actions.