构造四边形单元时，应用面积坐标方法有其优点。
The area coordinate method has been successfully applied to construct triangular elements.
针对四边形单元内电流的插值，推导出一组双线性插值计算式；
On the basis of the current interpolation of the quadrangle elements, this paper develops the computing expressions for bidirectional linear interpolation.
有限元模型采用单元边长比接近于1的高精度四边形单元划分网格。
Finite element model mesh use the high-precision rectangular unit which aspect ratio close to 1.
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