ADJ-GRADED
(声音或动作)震颤的，颤抖的，打战的；（笑容）怯生生的，不自然的
If someone's voice, smile, or actions are tremulous, they are unsteady because the person is uncertain, afraid, or upset.
例句
She fidgeted in her chair as she took a deep, tremulous breath.
她在椅子上坐立不安，轻颤着深吸了一口气。