This fish has very vivid nuptial coloration, which it uses to attract females.

Mieko is my best friend.

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.

He explained in detail about the structure of the sphenoid bone.

He drew a straight line using a T-square.

She is learning the grammar of the present progressive form.

Quantum chromodynamics is a part of particle physics that describes strong interactions.

His hair was jet-black, and it was very beautiful.

He participated in the parade while waving the tricolour.