From the back of the village can see clearly the Yin source there are a dozen dense narrow rectangular patio, patio courtyard, courtyard.

从村子后面能清楚地看到尹源密集着十几幢有着狭长天井、长方形天井的三合院、四合院。

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By regarding a linear light source as a directional rectangular light source with infinitesimal width, a simple formula is derived for calculating the diffuse reflection component.

通过将线光源看作一个具有无限细小宽度的有向长方形光源，我们得到了一个计算漫反射分量的简洁公式。

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The FDM numerical analytic method is applied to calculate the fin efficiency of elliptic tube with rectangular fins on which the disturbing holes were dug by using additional source term technique.

采用有限差分数值分析方法，应用温度逐次更新处理技术对不同扰流孔下的椭圆管矩形翅片的肋效率进行计算。

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