n. 差异( differential的复数形式 ); 工资级差; （汽车）差动齿轮; 分速器

n. the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx

n. a quality that differentiates between similar things

n. a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves