... variation in thickness 厚度变化 variation magnetic field 变化磁场 variation principle 变分原理 ...
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起步实验：探究变化磁场中发生的现象？
更精确地说，电势产生电场，这一观点是错误的，如果忽略变化磁场的存在的话。
More precisely it tells you that what you might have learned about electric fields deriving from electric potential becomes false if you have a variable magnetic field.
磁刺激是利用变化磁场产生的感应电场作用于可兴奋人体组织的过程。
The magnetic stimulation is the process that the excitable human tissue is acted with the electric field induced by the changing magnetic fields.
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