The temperature difference variation of model boundary shows the space gradient of temperature field, and the larger boundary temperature difference requires higher order.
模型边界的温差变化表现了温度场的空间梯度，越大的边界温差需越高的计算阶数。
It is found that the canonical momentum is directly proportional to the gradient of space phase.
发现正则动量与空间相的梯度成正比。
Strong two dimensional effect on the field penetrating speed should be included in the fluid analysis for a plasma space distribution with high density gradient.
对于等离子体空间分布存在较大的密度梯度的物理问题，必须考虑二维空间特性对磁场渗透速度的影响。
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