第二次世界大战期间,苏联的强击机曾在德军阵地上空反复进行超低空飞行,既不投弹也不射击,但坚啸刺耳、令人难以忍受的噪音却使德军官兵惊恐万状,战斗力锐减.原来这是苏联红军专门利用噪声给德军以心理打击的战术行动.随着现代科学的发展,人们发现,真正厉害的声音却是那些人耳所听不到的声音一次声. During the Second World War, the Soviet attack aircraft repeatedly conducted ultra-low altitude flight over the German positions, neither firing nor shooting, but the crackling, unbearable noise caused the German officers and men with terrified terror and the combat effectiveness dropped sharply. This is a tactical operation by which the Soviet Red Army uses the noise exclusively to the Germans to attack psychologically, and with the development of modern science people have found that the real voice is the one that people can not hear.