Kageichi is my best friend.

One part is important.

He read the Thousand and One Nights and was drawn to the charm of the Orient.

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.