undetermined
How could anyone break into the palace undetected?
怎么会有人神不知、鬼不觉地潜入皇宫呢？
They managed to get away from the coast undetected.
他们设法神不知鬼不觉地离开了海岸。
They feared some undetected trace of poison.
他们担心一些未被识破的投毒痕迹.
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