Psychologically defined, concentration is the process of centering one's attention over a period of time.
按心理学定义，专心是一段时间内集中注意力的过程。
We position the brush over the canvas, centering the brush precisely over the point where that distant detail should appear in the image.
我们把画笔定位于画布上，画笔的中心严格的对应于远处的细节应该在图像上占据的那一点。
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