piano前面要加the。piano的意思是钢琴。西洋乐器前面要加定冠词the。piano的例句：She played the piano confidently but her timing was not good（她钢琴弹得很自信，但是节奏掌握得不好）。
piano的例句：I stumbled through the piano piece with difficulty（我断断续续地好不容易弹完了那支钢琴曲）；She's practising for her piano exam（她在练习准备钢琴考试）。
