The discrete plight reflected in the discrete process of education of problem student, the discrete cause analysis, the discrete educators, the discrete methods.

这种“离散”的困境主要表现为问题学生转化过程离散、成因分析离散、执行主体离散、方式方法离散四个方面。

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Then, double integration is transformed into double sum through discrete methods. And finally, we get the formula in engineering to solve such calculation with great importance in practice.

然后，应用离散方法将双重积分转化为双重求和，得出了可用于船舶空间磁场工程计算的实际公式，具有实用价值。

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Put simply, a class is a discrete block or bundle of variables and methods.

简单地说，类是一个由变量和方法组成的离散块或束。

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