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单词 petrolatum
释义 petrolatum
[´pe·trǝ`lād·ǝm]
MATERIALS
A smooth, semisolid blend of mineral oil with waxes crystallized from the residual type of petroleum lubricating oil; the wax molecules contain 30-70 carbon atoms and are straight chains with a few branches or naphthene rings; used as a lubricant, as a carrier in polishes and cosmetics, and as a rust preventive.
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