The pressure gradient and the difference in temperature between day and night were often the key obstacles to meet the requirement of standard laboratory animal facilities.
梯度压差和日温差是影响实验动物科技设施环境条件达标的关键。
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。
By theoretical calculation, it is found that the same earth temperature gradient leads to the greater difference of temperature stress in different kind of rocks.
理论计算发现，相同的地温梯度在不同的岩石中引起的温度应力相差很大。
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