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预定航线 yùdìng hángxiàn
avia. pre-determined routes; advisory route; scheduled course (向); pre-determined route
space scheduled course
tech. predetermined course; preset course; scheduled course-line
预定航线[向] yùdìng hángxiàn
space predetermined course
预定航线: 6 phrases in 3 subjects
Aviation3
International trade2
Technology1