编辑点评：中岛吧台设计有延伸空间的视觉效果，恰好又与天花板的吊灯相对称，增加空间的对称美。

Edit Comment: Nakajima bar design has extended visual effects, just with the ceiling chandelier symmetry, increase the symmetry of space.

借助内积与长度与夹角给出了欧氏空间的变换是反对称变换的若干个充要条件。

A few good necessary and sufficient conditions are given by using inner product and length relation for antisymmetric transformation on Euclidean space.

它进一步说明一个四元流形的截面曲率的估计对许多对称黎曼空间都是有效的。

It proves that the estimate sectional curvature of a quaternion manifold is very useful for Riemann symmetric space.

规律之一是对称-对称的确是相貌更具吸引力。

One rule is symmetry - it does make faces more attractive.

本文讨论对称及广义对称非线性系统的可达性与可控性。

This paper discusses the reachability and the controllability of symmetric and generalized symmetric systems.