在数理逻辑中，自然演绎是证明论中尝试提供象“自然”发生一样的逻辑推理形式模型的一种方式。这种方式对比于使用公理的公理系统。
“义乌精神”从无到有再到向“新义乌精神”的嬗变，存有一个可资探寻的自然演绎逻辑。
The evolution of "Yiwu spirit" from scratch and then to the "new Yiwu spirit", has a capital to explore the natural deductive logic.
它们是自然互生，基于一种推和拉的投射和演绎。
They are naturally co-creations based on a push and pull of projection and interpretation.
巴西的Sadia和perdigao演绎了第四种策略：利用国内的自然资源，以一流的营销和分销手段炒作。
Brazil's Sadia and perdigao exemplify the fourth strategy: taking advantage of natural resources at home, and boosting them with first-class marketing and distribution.
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