以下为句子列表：
英文: After determining the assemble scheme, the closed forward and inverse solution and velocity Jacobin matrix of the two degree of freedom parallel mechanism are obtained.
中文: 摘要在确定机构装配方式基础上，求解了二自由度并联机构的位置正反解和速度雅克比矩阵。
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英文: The very important part for wave tomography is to get coefficentmatrix of tomography equations, that is the Jacobin matrix, or deviationderivative matrix of wave field to physical parameters.
中文: 波动成像最关键的一步就是求取成像方程的系数矩阵,也就是雅可比系数矩阵,也即波场对物性参数的偏导数矩阵。
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