二战中,一些美国陆军航空队轰炸机投弹手在接受精确轰炸设备训练之前,必须要宣誓严格保守自己接触到的秘密装备的技术信息,必要时甚至不惜以生命为代价保护秘密不至泄露。这种特殊的设备,就是诺顿轰炸瞄准具。要把一枚炸弹从高高的空中准确投向 During World War II, some bombers of the United States Army Aviation Corps must, before accepting training in precision bombing equipment, swear their pledge to strictly keep up with the technical information on the secret equipment they have come into contact with and, if necessary, even protect their secrets at the expense of life. This special equipment, is the Norton bombing sight. To a bomb from the high altitude accurate investment