We are planning to visit the nature reserve this weekend.

He is an expert in physical anthropology, conducting research on human evolution.

This photo has a shallow depth of field, so the background is blurry.

Einstein proposed the theory of relativity.

His actions always have a duality.

My younger brother caught the influenza.

This material has high corrosion resistance.

The prevention of venereal diseases is most important in safe sexual behavior.

This equation has homogeneity.

He was diagnosed with bipolar disorder.