Process operations practically will be affected by external environment , and the process could give rise to the condition of infeasibility . So the analysis of flexibility becomes an important topic in chemical process design .

由於实际化学制程的操作会受到外部环境的影响，而有时甚至会造成无法达成操作目标的情况，因此近年来弹性分析成为程序设计的重要课题之一。

Owing to such characteristics of service as invisibility , inseparability , quality differentiation , infeasibility to be stored , etc. employees in service enterprises play an important part while rendering their service .

服务的无形性、不可分离性、品质差异性、不可储存性等特征，使得服务企业的员工在服务过程中起着举足轻重的作用。