In each case, the cloud provided an abstraction of some part of the environment such that the user didn't have to perceive nor care about it.
在每种情况下，“云”都提供了对环境的某一部分的抽象，而这些是用户不需要去理解也不必关心的。
This architecture is divided into layers of abstraction starting with the external environment layer, the sensing and actuating layer, the connectivity layer, and the cognitive layer.
此体系结构划分为各个抽象层，从外部环境层开始，然后是感测和执行层、连接层，以及认知层。
There is no official list of levels of abstraction in an SOA environment.
在SOA环境中，并没有给出抽象级别的正式列表。
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