演示模式下怕自己讲超时了？设置线上互动小游戏要记录时间？课上上课给同学们设置答题时间？boardmix提供计时器，在不打扰您的正常演示、教学场景下，实时记录时间哦~你只需要提前设置一下倒计时就行啦~
ps：计时器支持协同啦，快来试试吧~
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