本文对分子轨道理论教学中关于对称性匹配原则，最大重叠原则， 分子轨道符号及反键效应等几个问题进行了讨论。
The present author discusses the symmetricalmatching principle, the maximum overlapping principle, the molecule orbitalsymbols and the anti-bond effect in the teaching of the molecule orbital theory.
这些原则(有可能重叠)可用于所有的可视化设计领域，包括平面设计、工业设计、建筑和美术。
These principles, which may overlap, are used in all visual design fields, including graphic design, industrial design, architecture and fine art.
手术原则是颈浅静脉切除，颈内静脉重叠缝合，以缩小血管内径。
The operative principle: is resection of the superficial jugular vein and the infoding suture of the internal jugular vein, so as to constrict the inside diameter of the blood vessel.
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