tremulous
adjective literary uk/ˈtrem.jə.ləs/ us/ˈtrem.jə.ləs/
（说话声或身体部位）微颤的
If a person's voice or a part of their body is tremulous, it is shaking slightly.
He watched her tremulous hand reach for the teacup. 他看着她的手微微颤抖着去拿茶杯。
In a tremulous voice she whispered: "Who are you people?" 她嗓音发颤，轻声问道：“你们是什么人？”