Equal (4): Everything in this space must be equal to 4. The answer is 6-4, placed vertically; 4-4, placed vertically; 4-3, placed vertically; 4-2, placed horizontally.
A NASA satellite that spent more than a decade coursing through the Van Allen radiation belts encircling Earth is about to fall back into the atmosphere.。新收录的资料对此有专业解读
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Фото: Daniel Becerril / Reuters