The variables are of randomness and relativity and can not be expressed by a common analytical expression.
由于这类变量的变化具有双重性，即随机性和相关性，不可能用一般解析函数表达。
Stated in matrix form, the module shuns the complex direct differential of mechanical output expression, and resolves the relativity of mechanical output parameter error successfully.
整个模型以矩阵形式表达，避开了对机构输出表达式直接微分时复杂的数学运算，成功地解决了机构输出参数误差的相关性问题。
Based on relativity quantum defect theory of ions energy levels, an expression of ionization energies of helium-like ions has been given.
依据离子能级的相对论量子亏损理论，给出了类氦离子电离能的一种表达式。
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