one and only
唯一的, 独一无二的
例句与用法:
She is my one and only friend.
她是我惟一的朋友。
The one and only way to rescuer him is to lower down a rope.
营救他的唯一办法是往下放一根绳索。
He is my one and only friend.
他是我唯一的朋友。