However the number of data in LCI is very large and it is difficult to determine the statistical function of data.So it is necessary to analyze the data selectively.

• 而生命周期清单中数据量大，不可能定量地分析每个数据的不确定性，所以必须要对生命周期清单数据进行选择，找出对结果不确定性影响大的关键数据进行定量分析。