I haven't been able to apply it as gracefully and productively ...

I haven't been able to apply it as gracefully and productively as when I'm working with Domain Models.

Domain Models.不用翻译！

什么意思？

i haven't failed. i never haven't you I haven't any money i haven't got a car i haven't it 对么 I haven't bought any new___for years. beck的 nothing I haven't seen歌词 I haven't see such an interesting book I haven't seen you since childhood. 翻译：Hello！I haven't seen you for years.