need a solution

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Some trainees speak publicly asked. they often feel excited, palpitations, cold sweat on the forehead, or the palm of the hand becomes cold and clammy? Some of them felt that the sweat pouring all over the body, hands and knees shaking or legs feel weak. No one complained of sudden sound hoarse or even not come out. One executive even admitted often experience the above symptoms if asked to represent the boss to deliver the annual plan in front of all employees. I was like that, does anyone know his solution?