... 形束 pencil of forms 形数 form factor 形态函数 morphic function ...
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pencil of quadratic forms 二次型束
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Belonging to a class of worlds known as diamond planets, 55 Cancri e is thought to be rich in the element carbon, which can exist in a variety of structural forms such as graphite (the material used as pencil lead), graphene, or diamond.
BBC: Oddballs: The strange worlds beyond our Solar System
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