If something trembles, it shakes slightly.(轻微地) 颤动 • He felt the earth tremble under him. 他感觉大地在脚下颤动。
Tremble is also a noun.颤抖 • I will never forget the look on the patient's face, the tremble in his hand. 我将永远不会忘记那病人脸上的表情和他颤抖的手。