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2.Eraser
（1）Spot erasion：click
，erase the written contents and operate its written contents Circle erasion：
，circle erase the area strokes and do the erasion operation
click
3. Revocate and restore
（1）Revocate：click
，revocate previous step, at most 20 steps can be revocated
（2）Restore：click
，re-operate the revocated operation, at most 20steps can be restored
4. Shrinkage function
，can enlarge or shrink on the existing page。
click
5. Slide screen clearance function
，sliding popup, slide to the right side then the existing written contents can be cleared.
Click
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