新概念4 第一课的句子课后题中比较了两个句子,读了两边没看出什么大的区别,请高手指教instead of saying:

新概念4 第一课的句子
课后题中比较了两个句子,读了两边没看出什么大的区别,请高手指教
instead of saying:
The only way that they can preserve their history is to recount it as sagas--legends (which have been) handed down from one generation of storytellers to another.
we can say:
The only way that they can preserve their history is to recount it as sagas--legends handed down from one generation of storytellers to another.
第一个句子中括号里的内容就是两个句子的不一样的地方.第二个句子是课本的原句.读了几遍,感觉第一个好像也对,但是区别到底在哪儿