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- Hi,阿忠~ From your test, "PPM“ means Product Portfolio Management, an aspect of Product Management. The meanings of "PPM" differ a lot in different aspects. In computing, it means Perl Package Manager, Probabilistic Packet Making and so on. In media, it means Portable People Meter. In audio, it means Peak Programme Meter. For more details, you can see the following explanation on Wikipedia. http://en.wikipedia.org/wiki/PPM0 votedDecember 28, 20090
- It's called "persistence of vision". It is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. For more details, you can see the following description on Wikipedia: http://en.wikipedia.org/wiki/Persistence_of_vision0 votedDecember 26, 20090

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