This technique for service composition can be used recursively any number of times, across any set of concerns, or at any level of abstraction.

这种服务组合的技术可以重复地使用无限次，不管您的关注点是什么，也不管抽象的层次如何。

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Moreover, these extensions were all achieved using the same basic approach: recursive application of the same basic set of concepts at different levels of abstraction.

此外，这些扩展都是通过使用相同的基本方法达到的：即在不同的抽象层面上递归地应用那些相同的基本概念集。

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All engineers follow this core set of principles when applying levels of abstraction.

所有工程师在应用抽象层次时都遵循这套核心原则。

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In the winter, dusted by fallen snow, its pure abstraction is set off by bare trees, a vision of cold, crisp beauty, its marble taking on the look of an all-white Agnes Martin painting.

WSJ: Fifty Has Seldom Looked So Good Bared | The Naked Museum | Sheldon Museum of Art | By Willard Spiegelman