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二战中,日本与德国、意大利组成了轴心国同盟。根据盟约,三国之间要进行军事技术的相互援助。但由于日本处于东北亚,与德意之间隔着中国、苏联两大战区,除了无线电通信外,双方难以联络。而当时的远程无线电技术落后,保密性又差,既无法传输机密技术图纸,又无法保证中途不被盟国无数的监听电台截获,这使日本一直无法从德国获取自己最需要的航空发动机、雷
During World War II, Japan and Germany and Italy formed the Axis-allies. Under the Covenant, mutual assistance in military technology should be carried out between the three countries. However, as Japan is in Northeast Asia and Germany and Italy are separated by two major war zones in China and the Soviet Union, it is difficult for both parties to contact each other except for radio communications. At that time, the long-range radio technology lagged behind and the confidentiality was poor. It failed to transmit confidential technical drawings and failed to ensure that interception by countless monitoring radio stations in the midst of the country was stopped. As a result, Japan has been unable to obtain its most needed aeroengine from Germany.