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1·Replaces the current quaternion with its natural logarithm.

用当前四元数的自然对数替换此四元数。

2·The log() function returns the natural logarithm (base E) of a number.

函数的作用是：返回一个数值的自然对数。

3·The natural logarithm of this ratio is called the logarithmic decrement.

此比率自然对数称为对数的减量。

4·The relative thickness of the frost layer on both surfaces obey the natural logarithm law.

两种表面霜层相对厚度呈自然对数分布。

5·Old orchard soil and new orchard soil the whole phosphorus concentration obey natural logarithm normal distribution.

老果园土壤和新果园土壤全磷浓度都服从自然对数正态分布。

6·For gray model, the longer of original datum, the higher precision during smoothing processing of datum and the lower precision during natural logarithm processing of datum, vice versa;

就灰色预测而言，如果原始数据列较长，对原始数据进行平滑处理所得预测模型精度较高，而对原始数据进行取自然对数的处理所得模型预测精度较低；

7·Through the discussion of computing formula for measuring high resistance by Mdoel NG82-1impact corrent galvanometer, it is discoverde that it is much casier to do calculation by natural logarithm.

通过对NG82-1型冲击电流计测高阻计算公式的讨论，找到用自然对数计算较为方便。