I believe it shows her throwing her hat up into the air.

我相信这表明她把帽子扔向空中。

So the next time you see that inevitable video on the evening news of the graduation at West Point and all the cadets throwing their hats up in the air, think about gunpowder.

因此，下次当你在西点军校毕业晚间新闻中看到不可避免的视频时，所有的学员都将他们的帽子高高举起，想想火药。