The sound is virtually undetectable to the human ear.
这声音实际上是人耳难以听得到的。
Look, it says here that the noise from it should be undetectable by other people.
看，这里说的是它发出的声音应该不会被其他人察觉。
她总是令人难以捉摸。
Worse still, such ploys are often undetectable.
更糟糕地是，这样的伎俩往往探测不到。
That an undetectable nuclear delivery system...
那个隐身的核传输系统…。
Almost undetectable with even the most delicate instruments.
即使最精密的仪器都几乎无法察觉的。
Hawking radiation from black holes would be so weak as to be nearly undetectable, however.
但是黑洞发出的霍金辐射非常弱以至于几乎无法探测。
Unlike an ocean wave, a wavefront or surface of constant phase is unobservable and undetectable.
和海浪不同，波阵面或固定相平面是不能观测和不能发现的。
Unlike an ocean wave, a wavefront or surface of constant phase is unobservable and undetectable.
和海浪不同，波阵面或固定相平面是不能观测和不能发现的。
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