We picked the upper-right position for this subject so that we could see the full shadow and most of the tracks that lead to the seagull.
我们选择把主体放置在右上交叉点，这样我们可以看到海鸥的整个阴影和指向海鸥的大部分足迹。
Move with the X axis micrometric movement the sharp shadow, till the digital comparator red light is on the zero right position.
微调移动X轴接近“十”字比较尺，直到数字比较器的指示灯在零点右边变亮。
Move with the X axis micrometric movement the sharp shadow, till the digital comparator red light is on the zero right position.
微调移动X轴接近“十”字比较尺，直到数字比较器的指示灯在零点右边变亮。
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