Offer ends March 13.
楼面凹凸不平、面积大，要将二维的元素立体呈现出来，只能在投影机器上做文章。
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For the next few days, Jupiter, Saturn, Venus, Mercury, Neptune and Uranus will all be visible at the same time in the night sky – although binoculars or a telescope will be needed to spot the latter two planets.
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