Translation of "Liberate" in Chinese

Actually I wanted to be a damsel in a tower guarded by seven dragons, and then a prince on a white horse would chop off the dragons' heads and liberate me.

其實我想做一個被關在高塔裏的少女，然後有一天，就會有一個白馬王子出現，把守衛著高塔的七條龍通通殺掉，救我出來。