In the past the main problem with asynchronous induction motors was the difficulty of varying their speed.
在过去，非同步感应发动机的主要缺陷是很难改变转子的速度。
Since Hume, the problem of induction had been a puzzle that baffled western empiricist scientists and philosophers.
自休谟以来，归纳问题一直是困扰西方经验主义科学家和哲学家的难题。
In each iteration, the numerical mode matching method is used to solve the forward problem of the induction.
在迭代过程中，数值模式匹配法用于求解感应的正演问题。
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