自然界从低级到高级的大多数生物，其生理和行为的功能多呈现日夜交替的节律，即昼夜节律。
In most organisms from lower species to higher ones, various physiological and behavioral functions are expressed rhythmically across day and night.
使用PMC评估性能有三种方法，从低级到高级依次是：原始pmc事件、指标和CPI细分模型。
There are three approaches to evaluating performance using PMCs from a low level to a high level: the raw PMC event, metrics, and the CPI breakdown model.
各个水平按照从低级到高级、从简单到复杂的顺序排列，水平之间相互联系，较低水平的基本原理和概念是下一较高级、复杂水平的分析起点。
The levels are related and interactive. The principles and concepts on lower levels are starting points for the analysis on higher, more complex level.
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