This black substance is carbon.

这种黑色物质是碳.

辞典例句

They were covered with feathers and a sticky black substance called tar.

他们的身上粘满了羽毛,还涂着一层粘粘的叫做沥青的黑色物质.

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These dark particles absorb more heat and so further speed up the melt.

这些黑色物质吸收更多的热量,从而进一步加速冰融化.

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