So we wanted to do a subtle manipulation, a very consciously undetectable manipulation.

我们想做一种微妙的操纵，一种非常难被察觉的操纵。

It's virtually undetectable. Nobody would be looking for it.

这很难察觉，而且根本没人想查。

And when HIV is undetectable, it's untransmittable, too.

只要检测不出，它就没有传播性。

We know that they are working on a bomb that's undetectable.

我们知道他们正在研究制造一枚不能被安全系统检测到的炸弹。

This technique allows short-haired wigs like Elevin's to be virtually undetectable.

这样一来，观众就几乎发现不了像十一这样的短发假发了。

But so long as it's kept dormant with drugs, HIV remains undetectable.

但只要药物控制能令病毒蛰伏在体内，就检测不出艾滋病毒。

Did you know that plants actually make sounds that are undetectable to the human ear?

你知道植物实际上会发出人耳无法察觉的声音吗？

Look, it says here that the noise from it should be undetectable by other people.

看，这里说它发出的噪音应该是其他人无法察觉的。

Now, more than a decade later, the ocean currents have dispersed the contaminated water, and radioactivity is undetectable.

现在，十多年过去了，洋流已经带走了受污染的水，放射性也检测不到了。

Let's say a plane crashes. An investigation proves that the crash was caused by an undetectable engine problem.

比方说发生了一场空难。调查证明这场空难是由未检测到的引擎故障造成的。