用适当大小的珍珠块以填满槽尾的空隙。
为了不让铜箔散开，每一个透明的环实际上都是铜箔里的一系列的曲线轮槽，而不是连续的空隙。
In order that the foil does not fall apart, each transparent ring is actually a series of curved slots in the copper rather than a continuous gap.
为了不让铜箔散开，每一个透明的环实际上都是铜箔里的一系列的曲线轮槽，而不是连续的空隙。
In order that the foil does not fall apart, each transparent ring is actually a series of curved slots in the copper rather than a continuous gap.
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