So here's an empty bag of chips that was lying on a table, and we're going to turn that bag of chips into a microphone by filming it with a video camera and analyzing the tiny motions that sound waves create in it.
这是一个空薯片袋，放在桌上， 我们要把这个薯片袋变为一个麦克风 用摄像机拍摄视频 然后分析视频中声音造成的微小振动。