"We can rule out that the dogs simply distinguish between the pictures based on a simple cue, such as the sight of teeth," said study author Corsin Muller.
研究作者科辛·穆勒说：“我们可以排除狗只是根据简单的线索来区分图片，比如看到牙齿。”
2
For packages, include the "TRT" or total running time and an outcue, the final words of voice track.
对于视频套装，还可以写下“TRT”(总播放时间)与音轨结束的提示语。
3
It's a simple visual cue to would-be visitors - and you'll also keep out any noise from passers-by.