首先，我们构造以目的和背景知识为双条件的条件句系统akc，给出它的一些证明论结果。

Firstly, we construct the conditional system AKC with double conditions for aim and background knowledge, give some results of its proof theory.

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并讨论了双公用齿轮机构优化设计的目标函数和约束条件。

Then in this paper the object functions -and restrained conditions for optimum design are discussed.

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然后利用双三角级数构造满足层板分层区位移边界条件的位移模态。

Then, a trigonometric series is applied to describe the displacement mode satisfying the boundary conditions.

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If I took two double stranded DNA molecules and I exposed them to certain conditions that caused them to denature, that means its native structure falls apart.

假如我把两条DNA双链,放在特定的条件下,使它们变性,变性表示使它们的原始结构分开

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