This mountain is made of diorite.

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.

He said, 'Where there is a will, there is a way,' and faced the difficult situation.

This mountain is mainly composed of granodiorite.

This shape is a parallelogram.

This shape is a parallelogram.