它可能是首先抓住你视线的东西，应该也要能锁住观赏者的注意力。
It is probably the thing that caught your eye in the first place and should be able to draw and hold the viewer's attention.
它和选择性聚焦的使用原因相同，将分散视线的背景最小化，突出从观赏者角度观看的物体。
It is used for the same reasons as selective focus, to minimize distractions in the background and focus the viewers eye on the subject.
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