undetected
柯林斯词典
1. ADJ If you are undetected or if you do something undetected, people do not find out where you are or what you are doing. 未被發現的
The spy ring had a fifth member as yet still undetected. 特務團夥的第五名成員仍未被發現。
They managed to get away from the coast undetected. 他們設法了離開海岸，竝未被人發現。
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