perpetual motion

例句：

1. 1.The sun shines brightly on the earth every day, making it a perpetual source of warmth and light.
   太阳每天灿烂地照耀着地球，使它成为一个永恒的温暖和光明之源。
2. 2. The perpetual motion machine is an ancient concept that has been proven to be impossible by modern science.
   永动机是一个古老的概念，现代科学已经证明它是不可能的。
3. 3. The perpetual motion machine was a popular scientific curiosity in the 18th century, but it was never able to achieve true motion without external force.
   永动机是18世纪流行的科学奇观，但没有外力作用就无法实现真正的运动。