tremulous

她的声音颤抖着，几乎听不清楚。

Her ___tremulous voice was barely audible.

激烈争吵之后，他用颤抖的双手端起咖啡杯送到嘴边。

With ___tremulous hands, he lifted the cup of coffee to his lips after the heated argument.

当面试官问她是否准备好开始时，她露出一个微微发颤的笑容。

She gave a ___tremulous smile when the interviewer asked if she was ready to begin.