perpetual motion machine of the first kind

例句：

1. 1. The sun shines perpetually on the earth.
   太阳永远照耀着地球。
2. 2. The river flows perpetually through the valley.
   这条河永远流经山谷。
3. 3. The stars are perpetually visible from space.
   星星从太空中总是可见的。