A process control alert occurs when a succession of data points shows an atypical pattern that was possibly caused by changes to the laboratory or manufacturing process.
当一连串的数据点显示可能由实验室或生产工艺变化引起了非典型模式时，表示出现了工艺控制警戒。
2
So the study of the effects on community structure and biomass of the soil nutrients, different distribution pattern is very important to the revelation of the law of vegetation succession.
因而研究土壤养分分布方式对群落结构和生物量的影响，对揭示植被演替规律具有重要的意义。
3
This paper analyses the structural pattern and community succession of three Changhsingian paleocommunities in Xingwen area by the mathematical statistics method and modern ecologic theory.