be (/feel) bewildered(/staggered/puzzled); get into knots; be in perplexity; be at a loss
❍ 一时，他很难估透八路军的来意，所以也不知该从哪里说起好，用～心神不安的一双眼睛，从脸到手，从手到脸，上上下下冲赵庆田、贾正连着打量了好几遍。(冯志《敌后武工队》440) He could not figure out and therefore did not know where to begin.His eyes darted back and forth between their faces and their hands several times. He was both puzzled and uneasy.
困惑不解kùn huò bù jiě
迷惑、不明白。be at a loss, get into knots, in perplexity, feel puzzled, be in a fog