它的形状来自一个法国的三片树叶的图案。
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.
32岁的Annan向时尚的纽约SoHo片区售卖印有非洲标志性图案和非洲英雄的T恤。
Annan, 32, started by selling hip T-shirts depicting African symbols and heroes in the trendy SoHo neighborhood of New York City.
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