He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

Well then, I'm off.

I am majoring in biophysics at university.

I am majoring in physical chemistry at university.

It is reported that North Korea has conducted another underground nuclear test.

He is spending a lot of time on experimental research.

The Reverse Address Resolution Protocol is a protocol for obtaining host names from IP addresses.

He is majoring in linguistics.

He has a deep interest in astronomy.

Electromagnetism is a part of physics that studies the interaction between electricity and magnetism.