If the two level curves are tangent to each other that means they have the same tangent line. That means that the normal vectors should be parallel. Let me maybe draw a picture here.
如果两个等高线相切，说明它们的切线相同，也就是说他们的法向量应该平行，我再在这里画个图。
The auto power spectrum curves of the dry parallel reactor are obtained from the prototype dynamic test.
通过干式空心并联电抗器的现场原型动力试验，得到该电抗器各方向的自功率谱曲线。
Based on these characteristic curves, it proves that the moving stiffness of the designed Parallel Bonding Mechanism meets the working requirements of IC Chip Die.
根据这些曲线，说明所设计的并联焊头机构的动刚度能满足IC芯片粘片机的工作要求。
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