The sky, in a sayingThe answer is Limit.
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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.，详情可参考heLLoword翻译官方下载
Lili BusbyBBC News NI