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.

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.