构造一对称拱坝作为对比拱坝，以白鹤滩拱坝为例，采用有限单元法对拱坝的地形不对称因素进行分析。
The factors of topography asymmetry upon the arch dam are analyzed in the essay by finite element based on Baihetan Symmetric Arch Dam.
使用矩阵运算代替对称分量法的传统序网故障变换，以实现不对称短路故障计算，并给出常见故障对应的参数矩阵。
Calculation formulas are proposed with matrices calculation to deal with unsymmetrical faults and parameter matrices for various faults are listed.
我们通过“一锅法”合成不对称化合物，缩短了化合物上一条侧链的方法来降低分子的对称性。
We have synthesised unsymmetrical compounds through a "one-pot"process, achieving reduced symmetry by shortening one side chain of target compound.
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