adj.未被發(fā)現(xiàn)的；未被覺(jué)察的

They feared some undetected trace of poison. 他們擔(dān)心一些未被識(shí)破的投毒痕跡。

It can conduct reconnaissance and surveillance while remaining undetected. 執(zhí)行偵察和監(jiān)視任務(wù)，而不被對(duì)方發(fā)現(xiàn)。

He was certain they had come in undetected. 他確定他們進(jìn)來(lái)沒(méi)有被察覺(jué)到。

The disease often remains undetected for many years. 這種病經(jīng)常潛伏多年而不被察覺(jué)。