破产。裁员。领导层变动。对于传统的教科书出版商来说，这十年过得并不好，因为很多人都在试图将业务从印刷转向数字化。
I am trying to make a zoom effect on a picturebox with mouse wheel. Everything is OK except that when I use mouse middle button to zoom in or zoom out, it is ok, but it does not zoom in or zoom out th
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