shaking

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

震える腕

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

恐怖、寒さ、または病状のためにしばしば不随意に震える腕を説明します

震える指

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

指さしたり、震えのために不随意に震える指を説明します