I am majoring in Korean studies at university.

He has a deep interest in paleozoology.

He is writing a thesis on paleogeography.

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

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

I am majoring in econometrics at university.

He is writing a thesis on fluid dynamics.

He is known as an expert in palaeoclimatology.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.