box is marked, whenever the document is updated and loaded the bitmap image is reloaded. The editing steps that you have carried out in the local copy of the image in the document are re-applied and the image is displayed.
框，则每次更新或装入文档时，都会重新装入位图图像。而且，会在文档中重复执行编辑图像的本地副本的步骤，并显示该图像。