1. Solar energy is a renewable energy source.
太阳能是一种可再生能源。
2. Batteries store chemical energy and convert it into electrical energy.
电池储存化学能并转换为电能。
3. An object in motion has kinetic energy.
运动中的物体具有动能。
4. Energy can be transferred or transformed, but it cannot be created or destroyed.
能量可以被转移或转换,但不能被创造或销毁。
5. Scientists study energy conversion to improve efficiency.
科学家研究能量转换以提高效率。