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2016-02-07 [有回复] Nexus 5·Google五阿哥真棒的！Cross-platform!
Fantastic cross-platform non-destructive PDF annotator. Infact the only one I could find (Evernote and Onenote need to import and create bitmaps, locking you in). Plays well with Dropbox. I have it on Windows 7, Windows 10, Android, IOS. Works wonderfully on all my devices and computers. And it seems to be free! 太棒了！