BigDecimal是标准的类，在编译器中不需要特殊支持，它可以表示任意精度的小数，并对它们进行计算。
BigDecimal is a standard class, with no special support in the compiler, to represent arbitrary-precision decimal Numbers and perform arithmetic on them.
利用这一结果计算透射系数可以达到任意高的精度。
The calculation of the transmission coefficient with this method will have arbitrarily high accuracy.
该模型可用于由任意形状建筑物和街道所组成的复杂微蜂窝区的场强预测，且具有计算效率和预测精度均高的优点。
This model is applicable for field prediction with relatively high efficiency and accuracy in a complicated environment with arbitrarily shaped streets and buildings.
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