This sentence is using the inclusive form.

This grammar rule is using the exclusive form.

Exclusive form of grammar is used to refer to a specific object only.

He is studying Japanese grammar.

His actions can be understood on the assumption that the hypothesis is correct.

Let's make a hypothesis with a basis.

He ate one apple.

He is studying Japanese.

The characteristic of annelids is that their bodies are divided into ring-shaped segments.

This butterfly valve is used to control the flow of fluid.