He is hoping that his salary will be increased.

He is asking for a reduction in taxes.

He is thinking of tax-saving measures to reduce his taxes.

The school rules of this school are strict.

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.