He is an expert in chemistry.

You can solve the problem by using this method.

This company strictly adheres to the principle of fair trade.

He saved money using the 'hou' (alternative spelling of 'fran') to go to France.

He has mastered all the uses of the Eighteen Arms of Wushu.

The use of bioweapons is prohibited by international law.

This bottle is reusable.

Who is the user of this software?

He is the most competent employee of our company.

Are you really not going to use this unused laptop?