形容詞 one and only:

1. eminent beyond or above comparison
   同義詞：matchless, nonpareil, one, peerless, unmatched, unmatchable, unrivaled, unrivalled

1. She is my one and only friend.
   她是我惟一的朋友。
2. The one and only way to rescuer him is to lower down a rope.
   營救他的唯一辦法是往下放一根繩索。
3. He is my one and only friend.
   他是我唯一的朋友。