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.

In his room, a Nazi swastika flag was hung.

There are a lot of clovers growing in my garden.

It is recommended to take 100 micrograms of this medicine per day.

The daily intake of this medicine is 100 micrograms.

I eat a croissant every morning.

He is suffering from a stomach disease.