图像组件复制到可绘图表面之前，其位置已有记录，能够保证绘制顺序正确。
Before the image components are copied to the drawable surface, their locations are recorded to ensure that they are drawn in the correct order.
在加利福尼亚大学河边分校研究绘图识别的机械工程副教授汤姆·斯塔霍维奇说，”当你做手写字是别的时候，有一个时间和空间的自然顺序。
When you do handwriting recognition, there's a natural temporal and spatial order to it.
拖到绘图页后，可以表示按顺序访问的数据，如存储在磁带上的数据。
Drag onto the page to represent sequentially accessible data, such as data on magnetic tape.
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