通过坐标变换使变化的物面边界条件及无穷远边界条件变为固定的有限范围内的边界条件。
Through transformations, the time-dependent boundary conditions on the airfoil contour and the boundary conditions at infinity are brought fixed to the boundaries of a finite domain.
远场边界条件由无穷远处的条件近似代替。
The boundary condition at farfield is approximated by that at infinite.
反德西特空间虽然无穷大，却有个位于无穷远的“边界”。
Anti-de sitter space, although it is infinite, has a "boundary, " located out at infinity.
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