Photochemistry is a branch of chemistry that studies chemical reactions affected by light.

Photochemistry is a branch of science that studies how chemical reactions proceed under the influence of light.

I used the student discount at the movie theater.

Paleoecology is a field of study that investigates the relationship between past organisms and their environment.

He is an expert in paleoecology, pouring his passion into studying past ecosystems.

He is known as an expert in Oriental studies.

I am learning the basic concepts of differential geometry.

He is an expert in pomology and has contributed to the improvement of many fruit varieties.

He is known as the kapellmeister of a famous orchestra.

I like learning instrumental music.