Soldiers in ancient Greece used polished shields to send battle orders to each other over vast distances in the form of flashes of sunlight.
古希腊士兵用擦得锃亮的盾牌,通过反射太阳光,相互之间长距离传送作战命令。
S old iers in ancient Greece used polished shields to send battle orders to each other over vast distances in the form of flashes of sunlight.
早在古希腊,相距较远的士兵通过利用抛光的盾牌来产生闪光信号传达作战命令。
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