求翻译：它在两三千年中，一直是以琴曲和琴歌两种体裁，伴随着人民生活，迂回曲折地、顽强地向前发展着。是什么意思？

It's two thousand or three thousand years, has been the piano songs and songs with Qin zither in two genres, along with people's lives, zigzags, strong development.