His piano performance is truly excellent.

Air pollution is having a serious impact on the health of the planet.

He burned firewood to keep warm.

The atmosphere of this planet is harmful to humans.

After retiring from the military, he began pursuing a new career.

He retired from the military last year.

Japan began the colonisation of Hokkaido in the 19th century.

Japan once colonised Hokkaido.

A tachyon is a particle that is theoretically predicted to move faster than light.

He has physical strength, so he can work for a long time.