translation.en: Well, what if you had a detector that was so small that it could circulate in your body, find the tumor all by itself and send a signal to the outside world?
translation.zh: 如果你有一个探测器， 它小到可以在你的体内循环， 自己找到肿瘤 并向外面的世界传送信号会怎样呢？