许多高级管理人员和项目经理都无法肯定敏捷流程的有效性，并怀疑这些流程提供的输出是否与传统项目提供的输出相同。
Many executives and project managers are unsure of the validity of agile processes and question whether they will deliver the same output as a traditional project.
因此，笛卡尔运用怀疑方法得出，与拥有不可确定的身体不同，拥有心理是肯定的。
And so, Descartes used the method of doubt to say there's something really different about having a body that's always uncertain, from having a mind.
当选择伴侣时感到怀疑与不肯定。
When you are choosing a life mate and have doubts about your choice.
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