I heard the beautiful song of a common blackbird in the park.

In physics, blackbody radiation is a very important concept.

The family crest of my house is Kago-me-mon.

He is known as a comic character.

Their problem was clearly visible to me, a bystander.

Her problem is obvious to me, who is looking at it from an outsider's perspective.

He was wearing a ski mask to protect his face from the cold.

He has an unserious attitude towards his work.

I'm troubled by his lack of seriousness.

I bought up all the main products.