Pàjīnsēn bìng de zhèngzhuàng zhīyī shì zhītǐ zhènchàn.
One of the symptoms of Parkinson's disease is limb tremor.
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usage
震颤 can describe physical trembling (as in a medical condition) or be used metaphorically for something vibrating intensely. In medical contexts it typically refers to involuntary shaking.
