以下为句子列表：
英文: In addition, the effects of stack structure and material property on the performance of the thermo-acoustic engine in terms of the critical temperature ratio were examined.
中文: 结果表明，合理设计板叠的结构和合理选择板叠的材料，可以使得系统在较低的温度下起振。
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英文: “Large negative pivot value(-2.02825928)in Eqn. System.May be because of a bad temperature-dependent material property used in the model.
中文: 不知为啥出现负值，修改了约束，载荷反正还是不行，请大哥们帮我看一下，啥地方出问题了？
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