The use of this machine is simple.

This water is dangerous to drink because it contains arsenic.

We conducted a new experiment in science class.

He is majoring in chemistry at university.

This computer can be used by anyone.

We will conduct a new chemistry experiment tomorrow.

He is an expert in chemistry.

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

This bottle is reusable.

Are you really not going to use this unused laptop?