This is a very subtle error that is difficult to detect and diagnose.
这是一个非常微妙的错误，并且难以检测和诊断。
Habits of the chain before heavy to fracture, always light that is difficult to detect!
习惯的链条在重到断裂之前，总是轻到难以察觉！
Lies are extremely difficult to detect.
谎言其实很难被发现。
This type of fraud is difficult to detect.
这类诈骗很难侦破。
This behavior may be subtle and difficult to detect, or it may be pronounced.
此行为可能是微妙的，难以察觉，也可能是显著的。
However, it is usually not difficult to detect which aim is the source of concern.
然而，我们通常不难发现哪个是其关注的目标。
They are difficult to detect by sonar because they have soft bodies with no skeleton.
巨型乌贼很难被声纳发现因为它们有柔软的身体而且没有骨骼。
Well, there is something still more hidden than air, more invisible, more difficult to detect.
然而，还是有东西藏在空气中，它更不可见，不易察觉。
Well, there is something still more hidden than air, more invisible, more difficult to detect.
然而，还是有东西藏在空气中，它更不可见，不易察觉。
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