Mary: Are you looking for something?
Carson: Lady Mary? I just wanted to make sure the room had been tidied up after the...after the people had left.
Mary: Life can be terribly unfair, can't it?
Carson: It certainly can.
Mary: Everything seems so golden one minute, then turns to ashes the next. Can I ask you a question, Carson? Have you ever felt your life was somehow slipping away and there was nothing you could do to stop it?
Carson: I think everyone feels that at one time or another.
Mary: The odd thing is I feel, for the first time, really, I understand what it is to be happy. It's just I know that I won't be.
Carson: Oh, don't say that, My Lady. Don't raise the white flag quite yet. You'll still be mistress of Downton. Old Lady Grantham hasn't given up the fight, not by a long chalk.
Mary: Oh, that...I wasn't even thinking about that.
Carson: And if I may say so, My Lady, you're still very young.
Mary: Am I? I don't feel it.
Carson: We're all behind you, My Lady. The staff. We're all on your side.
Mary: Thank you, Carson. You've always been so kind to me. Always. From when I was quite a little girl. Why is that?
Carson: Even a butler has his favourites, My Lady.
Mary: Does he? I'm glad.
Anna: Lady Mary. Oh, My Lady, I thought...
Mary: Carson and I were just making sure that everything was ship-shape and Bristol fashion. And it is.
Everything seems so golden one minute, then turns to ashes the next: 一切本是那么美好，忽然间就灰飞烟灭。
at one time or another: 曾经，早晚
raise the white flag: 投降，放弃。这里Carson的意思是：别轻言放弃。
not by a long chalk: (英国口语）绝不，相当于not at all, not by any means
We're all behind you: 我们都支持你，我们都跟你一条心。
Bristol fashion: 井然有序