短语词组短语axial snap -back 轴向回跳snap -back repeller 速返斥子deep Snap -back 深位移回跳billow snap -back forming 气胀快速反吸成型Snap -back repeller theory 返回扩张不动点理论vacuum snap -back forming 阳模反吸真空成型 返回 snap-back