这个机器老鼠和普通老鼠一样大，但看起来就像一个简易的带轮子的塑料盒子。
The robot was the same size as a regular rat but resembled a simple plastic box on wheels.
盒子里是一个漂亮的蛋糕，就像生日蛋糕一样。
射线通过一个小孔进入盒子，从而集中成一束。就像以前的针孔照相机。
X-rays enter the box through a small hole that in turn focuses them, like an old-fashioned pinhole camera.
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