adj.未被发现的；未被觉察的
They feared some undetected trace of poison. 他们担心一些未被识破的投毒痕迹。
It can conduct reconnaissance and surveillance while remaining undetected. 执行侦察和监视任务，而不被对方发现。
He was certain they had come in undetected. 他确定他们进来没有被察觉到。
The disease often remains undetected for many years. 这种病经常潜伏多年而不被察觉。
