贺卡上圣诞树的图案是在一小块玻璃上蚀刻而成的。
The image, which measures 200x290 micro-meters, features a Christmas tree, and is etched on a tiny piece of glass.
捷克斯洛伐克——圣诞树用雕刻有无规则图案的蛋壳来装饰。
Czechoslovakia - Trees are decorated with intricately carved designs on egg shells.
捷克斯洛伐克——圣诞树用雕刻有无规则图案的蛋壳来装饰。
Czechoslovakia - Trees are decorated with intricately carved designs on egg shells.
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