natural energy cycle

例句：

1. 1. The sun's energy cycle is essential for life on Earth.
   太阳的能量循环对于地球上的生命至关重要。
2. 2. The study of the earth's natural energy cycle has led to significant advancements in renewable energy.
   研究地球的自然能量循环已经导致了可再生能源的重大进步。
3. 3. In this cycle, the sun's energy is absorbed by the oceans and then released back into the atmosphere.
   在这一循环中，太阳的能量被海洋吸收，然后释放回大气层。