Made of two tiny tin beads usually used to calibrate electron microscope lenses, the snowman was built by the National Physical Laboratory.
这个雪人由英国国家物理实验室制造，使用的材料是通常用来校准电子显微镜透镜的锡珠。
Made of two tiny tin beads usually used to calibrate electron microscope lenses, the snowman was built by the National Physical Laboratory.
这个雪人由英国国家物理实验室制造，使用的材料是通常用来校准电子显微镜透镜的锡珠。
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