piano的复数

　　These pianos are of different widths.

　　这些钢琴的宽度是不一样的。

　　Maria: I know there's a company that used to make pianos.

　　玛丽亚：我知道那儿曾经有一个工厂生产钢琴。

　　Pianos stay in tune much better than most stringed instruments.

　　钢琴比大多数弦乐乐器音准。

　　Reduction of Symphony No.13, for two pianos four hands.

　　为双钢琴四手联弹而作的第13交响曲缩编谱。

　　The concert opened with a lively performance of a piece for two pianos.

　　音乐会以两架钢琴精彩地表演开始。