Focus: plane of focus; focal length; and depth of field.
焦距：焦点平面，焦距和景深。
We are going to focus just on depth.
我们将仅仅致力于深度方面。
In this paper, this is the most in-depth and focus boils down to a point.
这是本文最深入的一个着眼点和归结点。
This is the application of depth of focus.
在摄影中总是不能娴熟地加以运用。
This is the application of depth of focus.
在摄影中总是不能娴熟地加以运用。
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