He faced many difficulties before he succeeded, but as they say, the road to happiness is strewn with setbacks.

Watashi lives in Japan.

This species of bird has a polygynous breeding pattern.

The multi-armed bandit problem is a part of probability theory, providing an algorithm for making optimal choices.

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.