与 Kindle 的反射式墨水屏不同，智能手机的屏幕本身就是光源。
The company’s tech comes from an unusual source: a $100-million-endowed program at Caltech to develop orbital solar plants that would beam electricity to Earth below. The researchers ultimately settled on a sail-like structure that is thin and flexible compared to boxy, traditional satellites.
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Green: On the road again
We tested two different implementations: