She has polycystic ovary syndrome.

Due to the impact of the new coronavirus, we are forced to live a life with masks.

The concept of 'Bansei' is important in the ancient history of Japan.

He is studying the history of the conquest of barbarians.

He was dreaming of the conquest of Russia.

Due to his dwarfism, he is shorter than the average person.

This mature chicken is being raised for egg production.

In Japanese grammar, the nominative case is a very important part.

The company is facing an economic downturn.

Is this year a common year or a leap year?