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For a second time, Jim Lovell had brought the world together as one. The first time it had been for Earthrise, the second would be to witness his fight to survive.，详情可参考heLLoword翻译官方下载
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If we think about this algebraically, what we really want to do is express the input pixel as the weighted sum of palette colours. This is nothing more than a linear combination of palette colours with weights :