He is an expert in oceanography.

My major is oceanography.

Topography is a field of study that researches terrain and geographical features.

I can't go to college because the tuition is too high.

How much is the calculation for this product?

He earned a doctorate in the field of applied science.

He is majoring in Sinology at university.

This dress is currently on sale for half price.

Serology plays a very important role in the diagnosis of infectious diseases.

He is an expert in serology, working on research into infectious diseases.