Not only from direct scanning images but from reconstruction images , we could see that the movement of sublimation interface was a three - dimensional move mode , it contracted to the centre of the material 從直接掃描圖像和重構(gòu)圖像,均可看到升華界面的移動是一個立體的移動,由它所包裹的凍結(jié)區(qū)逐漸向物料幾何中心收縮。