• 1. pre existent slit: 预置狭缝
• 2. pre-existent slit: 预置狭缝

• 1.A new method with a pre existent slit for making rainbow holograms is presented.
  提出一种新的“预置狭缝法”制作彩虹全息图。
  dict.yoduao.com
• 2.The view Angle of rainbow holograms which are recorded using a pre existent slit or a pre existent slit with mirrors is analyzed in detail.
  对用预置狭缝法和带平面反射镜的预置狭缝法制作的彩虹全息图的视角问题作了详细的讨论。
  dict.yoduao.com

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