最小可觉差just noticeable difference, J.N.D
相位差，相差phase difference
个体差individual difference
个体差异ndividual Difference
气压梯度pressure difference
【计】 一阶差分方程first-order difference equation
差波束分离角separated angle of difference beam【电讯】;separated angle of offset beam【电讯】
【经】 计时差别timing difference