为什么rolling in the deep 里的 we could have had it all 是唱成we cou

为什么rolling in the deep 里的 we could have had it all 是唱成we cou We could have had it all Rolling in the Deep!这句话什么意思 急! 关于We could have had it all we could have had it all :We could have had it all we could have had it all为什么不直接用have it all? We could have had it all怎么读 we could have it all we could have had it an 是哪首歌里的 rolling in the deep Rolling in the deep. we could have it all是什么意思?