staff of life

• 1 nan ? well, nan was nan, and to harriet that was like bread, too everyday and too necessary to be regarded, though she was the staff of life
  原译)保姆呢？这个，保姆就是保姆呗！对哈丽特来说，那就像面包一样，虽然是主食，但每天少不了要吃，也就不放在心上了。