两个方程式只在Y项的定义上有差别，但是这个差别将使估算结果产生很大不同。
The two equations differ only in the definition of the Y term, but this difference can make a significant difference in the outcome of an estimate.
这个道理可以参考著名的爱因斯坦质能方程式，E=mc2, 能量E是质量m乘以光速c的平方项。
Einstein's famous equation, E=mc2, outlines how energy is equivalent to mass times the square of the speed of light.
方程式中只有弹簧力是耦合项。
Only the spring forces are coupling terms of motion equations.
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