She has polycystic ovary syndrome.

My younger brother caught the influenza.

This material has high corrosion resistance.

He was diagnosed with bipolar disorder.

He is writing a thesis on monotheism.

The success of this project is influenced by a lot of uncertainty.

This new software has backward compatibility, so you can use old version data without any problems.

These two software have complete interchangeability.

This new software maintains upward compatibility with the old version.

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