My grandmother is very kind.

My grandfather is healthy and living a long life.

He is the main organizer of this event.

I installed new software.

Gallium arsenide is a type of semiconductor, widely used in high-frequency electronic devices.

Oxygen, which is one of the chemical elements, is necessary for us to breathe.

This candy contains sorbitol.

The nitrogen cycle is very important for maintaining ecosystems on Earth.

My grandmother is suffering from osteoporosis.

His attack was very powerful.