As the chromophore relaxes, the twist of the C15 methine bridge about its two dihedral angles is reversed.

当发光基团松弛，C15次甲基桥的两个二面角的扭曲是相反的。

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In the form of propositions, this paper discusses several solution methods of the size of dihedral angles and proof and example are also offered.

本文以命题形式讨论无棱二面角的平面角大小的几种解法并加以证明和举例。

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In this paper, some relations of the invariants concerning the simplex and its tangent point simplex, are given and then, an inequality for the dihedral angles of a simplex is also presented.

本文首先给出单形的不变量和它的切点单形的不变量之间的若干关系式，然后再给出一个关于单形二面角的不等式。

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