Blur may be introduced by relative motion between a camera and the object, by a camera that is out of focus, and the other factors.
相机和目标之间的相对运动、相机聚焦不好、大气扰动和其他原因，都可能引起图像模糊。
Should the object come closer than this near point the image will blur.
如果物体比这个近点更近，那么图象就会模糊了。
Should the object come closer than this near point, the image will blur.
如果物体比这个近点更近，那么图象就会模糊了。
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