单词	pitch surface
释义	pitch surface noun : the surface of either of two tangent imaginary friction wheels having the same axes and the same angular velocities as those of a pair of real gears in mesh Word History Etymology pitch entry 4
随便看	sulfohalite sulfon- sulfonal sulfonamide sulfonamides sulfonate sulfonated sulfonated oil sulfonates sulfonating sulfonation sulfonations sulfonator sulfonchloramide sulfone sulfonephthalein sulfones sulfonic sulfonic acid sulfonium sulfoniums sulfonmethanes sulfonphthalein sulfonyl sulfonyl chloride

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