山的车轴和车轮的太阳能车。
几个小时的太阳光可以让这部不怎么漂亮的太阳能车以44公里每小时的平均速度行驶3小时。
A couple hours of sunlight will drive this not-so-pretty solar car for 3 hours at an average speed of 44 MPH.
先进的电池正逐步退出专业化市场，逐渐进入主流市场，这标志着电动车和屋顶太阳能推进器等前瞻性技术迎来了一个转折点。
Advanced batteries are moving out of specialized markets and creeping into the mainstream, signaling a tipping point for forward-looking technologies such as electric cars and rooftop solar propels.
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