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Hold your dominant hand out flat, palm up. Take a peek at your wrist, at exactly the point where your hand meets your arm. You may see some faint horizontal wrinkles. 摊开你的惯用手，掌心朝上。看一眼手腕，看看手掌和手臂相交之处。你或许会看到几条浅显的横纹。 Now clench your first and curl your wrist. Now, you should see several deep lines cutting across your wrist. 现在，攥紧拳头，弯曲手腕，你应该可以看到手腕划过几道深纹。 | 
