The answer lies neither in the overall chance of finding unobtainium, nor the overall chance of receiving a false positive reading.

答案不在于找到难得素的总体机会，也没有获得误读的总体机会。

What we're looking for, though, is the chance of finding unobtainium once we know that the device did return a positive reading.

然而，我们正在寻找的是一旦我们知道该设备确实返回正读数时找到难得素的机会。

What we’re looking for, though, is the chance of finding unobtainium once we know that the device did return a positive reading.

不过，我们正在寻找的是一旦我们知道该设备确实返回正读数后找到 unobtainium 的机会。