三维线性中心势场 Three-dimensional line potential central field
三维线性弹性理论 D linear-elasticity
三维非线性 D nonlinear
三维非线性数字模型 d Nonlinear Digital Models
三维非线性有限元 three-dimensional nonlinear finite element method ; D nonlinear FEM
三维非线性比例微分 Proportional Differential
三维非线性分析 d nonlinear numerical analysis
三维非线性扩散方程 D nonlinear diffusion equations
有些运动主要涉及整体的垂直或水平运动，其中转动可以忽略，可以用三维线性运动的简单方程来研究。
Some movements involving primarily vertical or horizontal motions of the body as a whole, in which rotations can be ignored, can be studied using simple equations of linear motion in three dimensions.
给出了三维线性中心势场不同幂次径向平均值的一般递推公式。
This paper put forward the recurrence formula for radial average values of three-dimensional line potential central field.
利用形式渐进分析，我们从三维线性动态方程组得到二维膜壳和弯壳的方程组。
By applying formal asymptotic analysis, we obtain two-dimensional model system of linearly dynamic elastic "membrane" and "flexural" shells from three-dimensional equations.
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