最有可能的是戴表时活动不够，手臂摆动较少，以至手表动力不足所至。
The most likely is that when the table is not enough, the arm swing less, and watch the power shortage to.
如果接受了正确的训练，来自不同国家的飞行员都能理解身体信号。当你沿一条直线上下摆动手臂时，就表示“是”。
Pilots from different countries understand body signals if they have the correct training. When you wave your arms up and down in a straight line, it means "yes".
当你向下指并左右摆动手臂时，这个动作的意思是“不”。
When you point downwards and swing your arm from side to side, it means "no".
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