translation.en: The problem is the efficiency is one hundredth of one percent, because you're heating all the metal of the chamber and then cooling all the metal of the chamber each time.
translation.zh: 问题在于效率只有百分之一。 因为热量是用于加热整个缸体的金属体， 相应地每次也需冷却整个缸体的金属体。