The calculation of head reluctance deals with two conditions in which the core material permeability is real or complex.

磁头磁阻的计算中，分别就磁芯材料的磁导率为实数和虚数的情况进行了讨论。

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It might not operate in real-time or handle the complex simulations we do, but they always have something there.

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The process of 3-D printing uses computer-created digital models to create real-world objects -- everything from simple toys or jewelry to more complex objects with moving parts.

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