perpetual motion machine of the second kind

例句：

1. 1. The perpetual motion machine of the second kind isa fascinating concept in science fiction.
   第二类永动机是科幻小说中一个引人入胜的概念。
2. 2. The discovery of this machine has sparked debate about the possibility of creating atruly perpetual motion machine.
   这种机器的发现引发了关于是否能够创造真正永动机的辩论。
3. 3. The perpetual motionmachine of the second kind is a theoreticalconstruct that has been studied for centuries,yet it remains an enigma tous.
   第二类永动机是一个经过几个世纪研究的理论构造，但它对我们而言仍然是一个谜。