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- 理论theory
- 理论的academic
- 理论上theoretically
- 理论知识speculative knowledge
- 雁行geese flying in a line-brothers
- 理论基础theoretical principle
- 理论上的theoretic
- 雁行排列en echelon arrangement
- 雁行裂隙en echelon fissure
- 军事理论Military Theory
- 雁行裂缝echelon fissures
- 理论体系system info
- 雁行断错en echelon offset
- 理论依据theoretical foundation
- 雁行式构造en echelon structure
- 理论力学theoretical mechanics
- 雁行透镜体en echelon lenses
- 理论研究theoretical research
- 雁行成行Wild geese fly in formation; to order of geese in their flight; said figuratively of brothers
- 雁行气法wild goose flying exercise