用于ppt计时的倒数计时器，很适合各种比赛答辩，使用-Countdown timer for ppt timing, it is suitable for the various competitions to reply,

一个幻灯片定时器，用于大学里的PPT演讲。可导入幻灯片，设置时间，启动定时器并且播放PPT-A slide timer for university PPT presentations. You can import a slide, set the time, start the timer and play PPT