He is interested in ichthyological research.

Alkaline earth metals are one of the main components of the earth's crust.

Rui is reading a book at the library.

Alkaline earth metals are located in Group 2 of the periodic table.

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.

Rui loves baseball.

Rui is accumulating study every day.

We will depart at dawn tomorrow.