We have a responsibility to protect the biodiversity of the Earth.

This metal has very high malleability.

Radioactive elements are produced in nature and scientific experiments.

This material has high corrosion resistance.

My younger brother caught the influenza.

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

This equation has homogeneity.

He feels dizzy when he stands up suddenly due to orthostatic hypotension.

My father was diagnosed with ankylosing spondylitis.

Special relativity is one of the fundamental theories of physics.