请高手帮忙翻译一句台词~

人没有牺牲就什么都得不到，为了得到什么东西，就需要付出同等的代价。这就是炼金术的等价交换原则。那时侯的我们，相信这就是世界的真理。
One can get nothing without sacrifice, and should pay the equivalent cost to achieve something. That is the rule of equivalent exchange for alchemy. Then we will believe it is the truth of the world.