上个月，在土星轨道上的宇宙飞船卡西尼号拍的这张照片，捕捉到土星著名的卫星中的两个，呈凸圆相位。
A view with two of the more famous moons of Saturn in gibbous phase was captured last month by the robot spacecraft Cassini now orbiting Saturn.
评论：虽然这个问题一般的客人是不会发现的，但那块直凸凸封在天花板上的白色圆盖，左想右想也不会想到是最新科技运用。
Comment: although the question would not be often noticed, but the white color round cover seems not look like the one connection with latest technique use.
提出了一种新的基于坐标旋转的凸包算法，并将其运用在对圆度误差的最小外接圆评定算法中，减小计算量。
The author proposed a new rotating coordinates convex hull algorithm, and using it in assessing roundness to reduce the computation.
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