They glanced backward over their shoulders from time to time, apprehensively, as if they feared they might be followed.
他们时不时不安地回头望望，好像怕有人跟踪似的。
He studied my face apprehensively, and I sighed.
他担心地审视着我的脸。
He glanced a trifle apprehensively towards the crowded ballroom.
他敏捷地朝挤满了人的舞厅瞟了一眼。
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