伪抛物型方程中关于时间与空间变量的混合偏导项给差分格式的讨论带来了一定难度。
The mixed partial differential terms of time variables and space variables in the pseudo-parabolic equation make the discussion of the difference scheme more difficult.
由于短时间内，内置钢管的塑料托盘是不会出现型变量的。
Due to a short period of time, the built-in steel plastic tray is not a type variable.
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