extension of trade theory
贸易理论的外延
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This paper not only introduces the theory of extension method and matter-element, but demonstrates trade-off analysis between efficiency and cost by means of extension theory.
介绍可拓学及物元理论，提出用可拓工程方法对武器装备效能-费用进行权衡分析。
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