Since Cassini was nearly in the plane of Saturn's rings, the normally impressive rings are visible here only as a thin line across the image center.
当时卡西尼号几乎是位在土星环面上，因此通常很壮观的行星环，在此时看起来只是一道贯过中央的细线而已。
2
World coordinates of geometric centerline of pruned plane was acquired by combination of Ultrasonic sensor and CCD camera.
超声波传感器和摄像机组合可获得修剪平面几何中心线的绝对坐标。
3
If the normal section in the center of the tooth line is taken as a tooth measuring and design section, when spline hob is designed in a plane meshing, the tooth profile error is minimum.