untraceable
adj. 难以描绘的;难以捉摸的;难以发现的
例句
Andre puts an untraceable cell phone into Jack's pocket and he leaves in the van.
安德烈将一个无法追踪的手机放入杰克的口袋里,然后他坐上车离开了。
Andre puts an untraceable cell phone into Jack's pocket, and he leaves in the van.
She urgently phones her contact and he orders her to go to Munich and remain untraceable.
她急切地打电话给她的联络人,对方指令她前往慕尼黑,并保持不被他人找到。