You can use several design patterns, such as Composite, Iterator, and Chain of Responsibility, to implement composition variation between services.

可以使用诸如 Composite、Iterator 和 Chain of Responsibility 等设计模式实现服务之间的组合变化。

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There are some important achievements in this paper in terms of the following aspects: I. Composition variation has impact on calculation of reserves when using pressure drawdown technology.

论文在以下几个方面取得重要研究成果：第一，组分变化对压降法储量计算的影响。

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Chemical analysis of invertebrate prey reveals remarkable variation in nutrient composition among species; even within species, nutrient composition may vary considerably.

对无脊椎动物猎物的化学分析显示，不同物种之间的营养成分存在显著差异；即使在种内，营养成分也可能有很大的差异。

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