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the forces of a country; the air forces
the Royal Air Forces of Great Britain
6.Strong enough to kill with his hands, and yet he loved music and sang with a wonderful voice.
But/ and yet表示转折 He is old, and yet he he jogs every day.
Though he was strong enough to kill with his hands, he loves music and sang with a wonderful voice.
Unable to work out the problem, John turned to his teacher for help. (形容词短语作状语)
7.power: n. ability to control to control sb. or sth.