The study of filterable pathogens is an important part of virology.

She was diagnosed with polycystic ovary syndrome.

UNESCO is an international organization that promotes the development of education, science, and culture around the world.

He was promoted to the chief operating officer of the company.

He was appointed as the chief financial officer of our company.

He was appointed as the chief executive officer of the company.

He always keeps the proverb 'Do not make friends with those who are not like you' in mind.

He is the chief technical officer of our company.

He is active as the chief information officer of our company.

After he left, she remembered the proverb 'feelings for a departed one grow weaker over time'.