本文从群体水平上研究了蒙古栎林生态系统中的水分循环与养分循环的关系。
The relation between water cycling and nutrient cycling was studied from, community level in the oak forest.
领导行为、集体效能更应该看作是群体水平的预测变量，角色投入更应该看作是个体水平的预测变量。
Leadership behavior and collective efficacy should be regarded as group variable, and role involvement should be regarded as personal variable.
研究者从个体特征、互动水平、关系水平、群体水平研究了影响儿童受欢迎的因素及受欢迎儿童的特点。
Researchers study the effects on childrens popularity and the features of childrens popularity within individuals, within interactions, within relationships, and within groups.
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