Reasons: (expression of disdain) that there is nothing to show off, and tell you that either I was born a few years later than in Einstein's theory of relativity is I invented it.
理：(不屑的表情)那有什么好炫耀的，告诉你，要不是俺比爱因斯坦晚出生几年，相对论也是俺发明的。
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。
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