名詞 sweetheart:

1. a person loved by another person
   同義詞：sweetie, steady, truelove
2. any well-liked individual
3. a very attractive or seductive looking woman
   同義詞：smasher, stunner, knockout, beauty, ravisher, peach, lulu, looker, mantrap, dish

形容詞 sweetheart:

1. privileged treatment of a favored person or corporation (sometimes unethically)

1. A favored female companion or sweetheart.
   女朋友最喜歡的女性同伴或愛人
2. His sweetheart is a pretty girl.
   他的情人是一個可愛的女孩。