The study of superconductivity is an important field in physics.

He decided to become a skinhead.

I talked to him through the intercom.

My new smartphone is very fast and easy to use.

I bought new earphones.

I would be in trouble without my mobile phone.

He started his speech using a microphone.

He broke his leg bone.

Many ancient bones were found in this ancient ruins.

Bones of ancient people were discovered from this ruins.