因此，由于在新知识的获取方面进行合作交流，方差随着时间减少了。

Hence, the variance diminishes over time due to collaborative interaction on new knowledge acquisition.

youdao

该方法基于一个隐含的假设，即可以肯定地做出计划：也就是，持续时间的方差非常低。

It is based on the implicit assumption that the plan can be made with certainty: i.e., that the variance of the durations is very low.

youdao

例如，与项目成本或持续时间无关的度量标准不能帮助评估迭代中的方差削减。

For example, a metric that does not correlate to the project cost or duration cannot aid in assessing the variance reduction in the iterations.

youdao