以下为句子列表：
英文: A dynamic model of gas diffusion without wind is established according to the Grads Theory.
中文: 在限定容器中气体介质是中性气体的情况下，由于中性气体在扩散过程中各向同性，扩散方程获得了简化。
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英文: A three-dimensional numerical simulation is used to predict the exhaust gas diffusion from a tunnel portal under different wind velocity and direction.
中文: 摘要采用三维数值模拟的方法，对隧道峒口废气的扩散情况进行了预测和分析，揭示了在不同风速和风向条件下，峒口废气的扩散特征。
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英文: By using the new method of variable separation with addition, semi-analytical solutions of 2-Dimensional (2-D) steady incompressible viscous gas diffusion flow field are obtained in the paper, and suitable conditions are discussed.
中文: 摘要运用加法分离变量法，解析求解了二维定常粘性气体不可压缩扩散流场，得到了几组空气流场有源汇和无源汇情况下扩散流场的半解析解，并分析了其适用条件。
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英文: The paper enlarges the domain of using the method of variable separation with addition, and beneficially tries to obtain analytical solutions of complicated problem, such as 2-D steady incompressible viscous gas diffusion flow field.
中文: 拓展了加法分离变量法的适用领域，并对二维定常粘性气体不可压缩扩散流场这类复杂问题的解析求解进行了有益的尝试。
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英文: Therefore, the accidental poisonous gas diffusion is an important content in safety assessment.
中文: 笔者通过梯度输送理论，建立了无风条件下气体扩散的动态模型。
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