... 第一谐地址 first-level address 第一阶；第一次 first-order 第一阶微扰 first-order perturbation ...
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结果表明，夹板只对第一阶固有频率有较大提高。
The test result shows that clamper greatly increases only the first natural frequency.
矩阵迭代法是求矩阵的第一阶特征值与特征向量的一种数值方法。
Matrix iteration method can be employed to figure out the first eigenvalue and eigenvector of a matrix.
而另外一阶模态可能具有与第一阶模态不同方向的响应，而在其他方向上几乎没有响应。
Yet another mode of the structure may have response in a different direction than the first mode with little or no response in the other directions.
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