retention is the resistance of the denture to removal along its path of insertion.
固位是义齿抵抗从其就位道脱位的能力。
In an unbounded homogeneous medium, waves propagate without interruption at a constant speed and along a fixed path. But with the insertion of an obstacle in the medium, some secondary waves will be emitted from the obstacle, which is called scattering.
波在一个无限的均匀介质里,是以常速度沿着固定路线不受干扰地向前传播的,但若有障碍物嵌入介质,则会产生波的散射。
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