Parts of the plot might remain undetected, Obama's counterterror chief warned.
白宫反恐负责人警告，该阴谋事件尚未完全侦破。
This type of clot is known as a chronic subdural haemorrhage, and can remain undetected for some time.
这种类型的血块是已知的作为慢性硬膜下出血，并能保持未被发现了一段时间。
Panda pregnancies can last anything from 11 weeks to 11 months and can remain undetected until shortly before birth.
大熊猫的妊娠时间能持续11周到11个月不等，甚至到产崽时也不容易被发现。
Might it exist on Earth today in extreme environments and remain undetected because our techniques are customised to the biochemistry of known life?
也许今天，这些生命存在于我们地球上的一些极端环境中，并且仍旧未被探测到，因为我们的技术一直在探测我们所知道的生命形式。
Might it exist on Earth today in extreme environments and remain undetected because our techniques are customised to the biochemistry of known life?
也许今天，这些生命存在于我们地球上的一些极端环境中，并且仍旧未被探测到，因为我们的技术一直在探测我们所知道的生命形式。
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