Terrain factor is introduced around the definition, the mathematics expression and the abstraction algorithm, etc.
从定义、数学式表达、提取算法等几个方面对地形因子进行阐述。
In the interaction problem of different parts of solid, the relation of some physics factors' determining is often transformed to the mathematics expression of integral equation.
在变形固体相互作用的问题中，某些物理量之间的关系确定，经常被转化为积分方程的数学表达。
Parentheses may be used in an expression to indicate the order of operations, in the same way they are used in mathematics.
表达式中可能使用括号来指明运算顺序，这和数学当中是一样的。
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