诺斯罗普·格鲁曼公司是美国空军B-2远程打击隐形轰炸机的主要承包商。
Northrop Grumman is the Air Force's prime contractor for the B-2, the flagship of the nation's long range strike arsenal.
而X-45N，主要是根据美国空军要求设计制造，美国空军已于去年夏天终止了这一设计需求。
The X-45N, however, emerged in response to a U.S. Air Force requirement, which dissolved last summer.
而X-45N，主要是根据美国空军要求设计制造，美国空军已于去年夏天终止了这一设计需求。
The X-45N, however, emerged in response to a U. S. Air Force requirement, which dissolved last summer.
美国空军系统分为四层，高度最低的一层是建议名称为N/A层，小型无人机的独特性质正是该层区别于第一层的主要标志。
The USAF system has four tiers, and the lowest-altitude layer is the suggestively named tier N/A, which was carved out of tier 1 in prospective recognition of the unique qualities of mini-UAVs.
美国空军系统分为四层，高度最低的一层是建议名称为N/A层，小型无人机的独特性质正是该层区别于第一层的主要标志。
The USAF system has four tiers, and the lowest-altitude layer is the suggestively named tier N/A, which was carved out of tier 1 in prospective recognition of the unique qualities of mini-UAVs.
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