flying fortress是什么意思 flying fortress怎么读
flying fortress的用法和样例
用作名词 (n.)
- The U. S. Army Air Forces believed in daylight bombing with the heavily defended Fortress type of bomber as the backbone of the organization.
美国陆军航空队，相信在白昼轰炸，应以防御性的空中堡垒重轰炸机为组织之骨干。
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