Accurate location and detection of reference points is an important step.
标定参考点的准确定位和提取是其中关键的一步。
Prepositions at and to form the direction of attack, location, bad, good points.
介词在形式和攻击的方向，位置，坏，善分。
Defects of different location bring about different photo-couple-points.
不同位置的缺陷其“像对点”是不同的。
Defects of different location bring about different photo-couple-points.
不同位置的缺陷其“像对点”是不同的。
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