But nanotechnology experts have unveiled a Christmas card so small that more than 8, 000 of them could fit on a first-class stamp.
但是纳米专家们已经展示了一种极小的圣诞卡，在一枚平信邮票上就能放超过8000个！
But nanotechnology experts have unveiled a Christmas card so small that more than 8, 000 of them could fit on a first-class stamp.
但是纳米专家们已经展示了一种极小的圣诞卡，在一枚平信邮票上就能放超过8000个！
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