密度差 Density contrast ; PV-L

温度差 temperature difference ; difference of temperature

辉度差 luminance difference

高度差 [测] altitude difference ; difference in height

光程长度差 Path length difference

最小可测温度差 MDTD

上下密度差 difference of densities

速度差 velocity contrast ; velocity disparity ; velocity difference

进度差异 schedule variance

尺度差 std ; Sigma