She struck the keys too hard and two of the strings were broken.two 后 为什么有 of the .为什么不能直接是two strings

She struck the keys too hard and two of the strings were broken.two 后 为什么有 of the .为什么不能直接是two strings
She struck the keys too hard and two of the strings were broken.
two 后 为什么有 of the .为什么不能直接是two strings

She struck the keys too hard and two of the strings were broken.two 后 为什么有 of the .为什么不能直接是two strings
the keys 是特指.定冠词the,指的是她摔的这些钥匙,不是别的随便什么钥匙
of 是介词,表示多少中的几个,也就是不是全部的意思.two of the strings 其中的两串
她摔钥匙用的力量太大了,以至于把钥匙摔开了两串.
希望能解决您的问题.