轮胎设计者因此力求减少滚动阻力以提高能源利用的经济性。
Tyre designers have therefore sought to improve fuel economy by reducing rolling resistance.
投资者开始瞄准突破性技术：固态电池和氨燃料电池。利用这些技术，能源就能变得像砂砾一样，不仅廉价，而且易于储存。
Investors are prowling for a breakthrough technology-solid state batteries, ammonia fuel cells-that will make energy as cheap and easy to store as gravel.
一些能源倡导者说，我们需要直接地更多的鼓励太阳能的利用。
Some advocates say we need to encourage solar more directly.
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