gov·ern·ess /ˈgʌvɚ/
  女家庭教師
  Gov·ern·ess n.  A female governor; a woman invested with authority to control and direct; especially, one intrusted with the care and instruction of children, -- usually in their homes.
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  governess
       n : a woman entrusted with the care and supervision of a child
           (especially in a private home)