A piano is a large musical instrument with a row of black and white keys. When you press these keys with your fingers, little hammers hit wire strings inside the piano which vibrate to produce musical notes.
例句
I taught myself how to play the piano...我自學了彈鋼琴。He started piano lessons at the age of 7.他7歲開始上鋼琴課。
ADV
輕輕地；微弱地
A piece of music that is played piano is played quietly.