When you wave your arms up and down in a straight line，it means"yes"．
当你在一条直线上下挥动手臂时，它的意思是“是的”。
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".
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”。
跟我做，挥挥手。
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