我意外发现了一种极其简单但又非常准确地知道我的钱去向何处的方法。
I stumbled across an extremely simple but very exact method for understanding where my money went.
有的可以便于携带。比如说，一队警察小组计划突袭时，可将设备靠在墙外来查看里面人的位置。这种设备有不错的准确度，使用起来却极其复杂。
Some are portable enough to be placed against an outside wall by, say, a police unit planning a raid-and sophisticated enough to show, with reasonable accuracy, the location of anyone inside.
你的电脑键盘能把你鼻子里和胃里的东西极其准确地表现出来。
Your keyboard can be an incredibly accurate representation of what's in your nose and your stomach.
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