1·Values are not approximations to prices nor a necessary step in their calculation.
价值并不是价格的近似值，也不是价格计算必须的步骤。
2·Such estimates should be considered only as crude approximations.
上述估算结果只能是粗略的近似值。
3·By using the mean values of the periodic coefficients, the approximations of the unstable frequencies are obtained.
用周期性系数的平均值法获得了不稳定频率的近似值。
4·All dimensions specified are approximations only. Unless stated otherwise, the least significant digit is uncertain by plus or minus one unit.
所有特定尺寸都只是近似值。除非特殊说明，否则最不重要的数字的不确定性体现在加上或者减去一个单位。
5·Approximations and Modeling Limitations.
近似值和模型极限。