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Sometimes sign a handshake. Who can overcome them?
Sometimes the signer will tremble. As long as it is not a high probability, it may not be morbid in the physiological sense. It may be caused by some scenes that make you nervous. It is good to change this environment that leads to psychological tension. If this happens frequently, you should go to the hospital for examination, which may be a precursor or external manifestation of a certain disease.