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.
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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