Then, pop back to the original matrix and draw the gray square.
然后，取出原始矩阵并绘制一个灰色正方形。
Prints are created from a single original surface, known technically as a matrix.
版画是由一个单一的原始表面，众所周知，在技术上作为一个矩阵。
Prints are created from a single original surface, known technically as a matrix.
版画是由一个单一的原始表面，众所周知，在技术上作为一个矩阵。
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