Pencil lead holders 铅笔芯盒
Slide Pencil Lead 旋转的铅笔 ; 抽铅笔芯汉化版 ; 抽铅笔芯
pencil lead holder 铅笔芯盒
Load Pencil Lead 巧收铅笔芯
Sidle Pencil Lead 旋转的铅笔
lead pencil 铅笔
pencil lead loose 铅笔芯松
Do you think pencil lead will wash out of this white shirt?
你认为铅笔痕能从这件白衬衫上洗去吗?
Layers of graphene make up the graphite found in pencil lead.
铅笔芯里的石墨就是由多层石墨烯组成的。
A discovery made from pencil lead is promising to change the future of the electronics industry.
科学家一项从铅笔芯中作出的发现,势必将改变电子产业的未来。
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