Migration is usually defined as "permanent or semipermanent change of residence".
移民通常被定义为“永久或半永久的居住变化”。
In machine construction, couplings are used to effect a semipermanent connection between adjacent rotating shafts.
机械构件中，联轴器可以用来实现相邻两根旋转轴的半永久性联接。
In machine construction, couplings are used to effect a semipermanent connection between adjacent rotating shafts.
机械构件中，联轴器可以用来实现相邻两根旋转轴的半永久性联接。
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