This textbook explains mainly in colloquial form.

He is completely nowhere to be seen.

Her necklace was in the beautiful shape of a butterfly.

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 likes to take a walk in the park at dusk.

We should always remember the power of Kannon in difficult times.

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.