Nellie: What a pinhead I was.
Nellie: Mother says older men are better for a girl than young men.
Lt. Cable: This has been a discouraging day for me.
Nellie: You know what I mean, Emile?
Emile de Becque: Yes. We're both knuckleheads - cockeyed optimists.
Emile de Becque: What makes her talk like that - you and she? I do not believe it is born in you! I do not believe it.
Lt. Cable: It's not born in you - it happens after you're born.
Emile de Becque: When all you care about is here, this is a good place to be.
Answer: Richard Rogers preferred the vocal performance of Muriel Smith who played the part in London. Since the vocal tracks for musicals was recorded separately from the filming back then, dubbing occurred for many reasons other than lack of singing ability of an actor, scheduling problems, budget, etc.
Myridon