Nitrous oxide, also known as laughing gas, is used for anesthesia.

This contract prohibits interference by a third party.

He said, 'If you want to shoot a man, first shoot his horse,' and began to solve the smaller problems first.

He acted according to my instructions one by one.

He is carefully doing each and every task.

He solved each problem one by one carefully.

He learned how to operate the anti-tank gun.

The presenter explained the results in detail.

He learned how to operate an anti-aircraft gun.

In physics, blackbody radiation is a very important concept.