全息图是用精细聚焦的离子束在一片30 n m厚的薄硅膜上切割出20nm长的极小的裂纹的图案组合而成的。
The holograms were fabricated using a very finely focused ion beam to cut a pattern of extremely small slits just 20 nm across through a thin silicon membrane 30 nm thick.
这个食品加工机有薄、中、厚的切片盘。
The food processor has thin, medium, and thick slicing discs.
高而薄的云层有助于升温，而低而厚的云层使地球冷却。
High thin clouds contribute to heating while low thick clouds cool Earth.
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