He was hiding the fact that he was an illegitimate child.

It is thirty-three kilometers to my house.

The statue of Fukurokuju symbolizes wealth and longevity.

Fukurokuju, one of the Seven Gods of Fortune in Japan, symbolizes longevity and wealth.

Isuzu is my best friend.

Koushirou is my best friend.

Kou Sennen is my best friend.

Photochemistry is a branch of science that studies how chemical reactions proceed under the influence of light.

The photoelectric effect is a phenomenon where a material emits electrons after absorbing light.

He turned thirty years old.