He is majoring in the subject of science.

He was looking at artworks in the gallery.

That decorated high-rise building is beautifully coloring the city skyline.

Today's lesson is mathematics.

I plan to spend this year's Christmas with my family.

I have been in a long-term association with him.

Dating with compensation is prohibited by law.

The problem of finding the least common multiple is one of the basic problems in mathematics.

They learned about the least common multiple in math class.

A coffee stain got on my new shirt.