She struck the keys too hard and two of the strings were broken.这句话里面two 后面为什么要加of呢?

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She struck the keys too hard and two of the strings were broken.这句话里面two 后面为什么要加of呢?

按键按得太用力了,弄坏了两根弦,不加of也没大问题,但弦肯定不只两根,two of就是强调弄坏的“其中”两根弦,这样比较顺口和地道吧