相传用英语翻译

devolute generation by generation

The good tradition of translation should be handed down by generation 没啥好讲解的啊，hand down 表示“相传”嘛

to inherit generation by generation

It is said...

spread from generation to generation

generation after generationfrom generation to generation

According to legend, in the eastern jin dynasty period of China 追问： 谢谢，不过我觉得应该要在legend前加上the，不知是否会更好？

Long ago ,in the ancient China,it's said that

优良的传统应该代代相传。Good traditions should be handed down from generation to generation. 讲解：1. "优良的传统" 应该不只一个，应是泛指而不是指某个传统，英语可用复数形式，也可用 "A good tradition..."。2. 用情态动词 should 表示“应该”。3. 传统是被人传的，所以用被动：be handed down（被传下去）4. 传递是从一代传到一代，所以是 from generation to generation5. 注意：此例汉语极为简洁：代代相传 = be handed down from generation to generation（被从一代传下到一代）