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1·These pianos are of different widths.

这些钢琴的宽度是不一样的。《新英汉大辞典》

2·He buys two pianos.

他买了两台钢琴。

3·Her father sold pianos and both her parents were respected piano teachers.

她的父亲售卖钢琴，她的父母都是受人尊敬的钢琴老师。

4·Of course some of the other auditoriums have pianos, but that's not going to be easy.

当然，其他一些礼堂也有钢琴，但这并不容易。

5·Last Sunday, the choirmaster was jumping out of his skin, stormy then still, playful then tender, on the most upright of pianos and melodies.

上个星期天，唱诗班的指挥大吃一惊，时而平静，时而活泼，时而温柔，伴着钢琴立柱和美妙的音乐。

6·As mass production techniques were refined in the 19th century, the price of pianos dropped to the point that a larger proportion of the population could afford to own them.

随着19世纪大规模生产技术的改进，钢琴的价格下降到更多人都买得起的程度。

7·As pianos became more available, they brought classical music, the music which previously had been composed only for the upper classes, into the lives of the middle-class people as well.

随着钢琴越来越普及，古典音乐也随之进入了中产阶级的生活，而在此之前，古典音乐只是为上层阶级创作的。

8·Public pianos inspire street music

公共钢琴激起街头音乐浪

9·My friend and I were playing pianos.

我和我的朋友在弹钢琴。

10·However, not all pianos have this.

然而，并非所有有钢琴。