shaking

describes a hand trembling involuntarily, a common sign of nervousness, weakness, or illness

颤抖的手臂

describes an arm trembling involuntarily, often due to fear, cold, or a medical condition

描述手臂因恐惧、寒冷或疾病而不由自主地颤抖

颤抖的手指

describes a finger trembling involuntarily, perhaps when pointing or due to a tremor

描述手指不由自主地颤抖，可能是在指点或因震颤