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.
搔脖子。用手指搔耳部下方或脖子一侧，每次约搔五下，表示怀疑或不肯定。当听到与事实不符的话时，这一动作最为常见。
Scratching one's neck: Using one's forefinger to scratch the lower part of the ear or one side of the neck for 5 times, it shows one's doubt or lack of affirmation.
搔脖子。用手指搔耳部下方或脖子一侧，每次约搔五下，表示怀疑或不肯定。当听到与事实不符的话时，这一动作最为常见。
Scratching one's neck: Using one's forefinger to scratch the lower part of the ear or one side of the neck for 5 times, it shows one's doubt or lack of affirmation.
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