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primary structure (飞机结构,它的失效将会严重地威胁到飞机的安全。它包括机身、机翼、控制面和发动机架) | |||
main structure | |||
main frame | |||
primary construction | |||
major structure | |||
primary structure; principal frame; principal structure | |||
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main structure; major structure |
主 结 构 : 80 phrases in 24 subjects |