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

He drew a straight line using a T-square.

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

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

He drew an equilateral triangle shape.

This orthophoto shows the details of the terrain very clearly.

There are times when we perform calculations with the haversine in trigonometry.

He is an expert in orthoepy, teaching pronunciation.

A positive-definite matrix is an important concept in linear algebra.

He is suffering from acquired immune deficiency syndrome (AIDS).