Basic oxides react with acids to produce salt and water.

This area is affected by radioactive fallout from past nuclear tests.

It is important for us to respect cultural diversity and understand each other's differences.

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

She was diagnosed with polycystic ovary syndrome.

The police did everything they could to prevent his flight.

He is immersed in the study of Tang-Song phonetics.

We should join forces for the joint struggle.

He was looking far away.

His appearance is very youthful.