他突然改变话题，使她茫然不知所措。
His abrupt change of subject left her floundering helplessly.
他的辞职使我们不知所措。
她几乎常常中他吃惊，那时他的眼睛显得既不朦胧也不疏远，带着热切而凄楚的神情望着她，使她不知所措。
Too often she had surprised him when his eyes were neither drowsy nor remote, when he looked at her with a yearning and a sadness which puzzled her.
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