The preparation process comprises two steps: 1) preparation of the separating layer;

制备方法包括两个步骤：1）制脱离层；

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A common architectural strategy is to layer your system, separating your user interface logic, business logic, system logic, and persistence logic from each other.

通常的构造策略是将系统分层，将用户界面逻辑、商业逻辑、系统逻辑和持久性逻辑彼此分开。

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The power of this layer is in separating data access code from the business logic for disparate data store technologies.

该层的作用在于针对不同的数据存储技术，从业务逻辑中分离数据访问代码。

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When pressurized water is fed over such an intersection, the pressure pushes down the thin layer of rubber, separating it from the fluid below, and it clamps shut the fluid channel below, like stepping on a hose.

FORBES: Science Beyond Belief

The question is one of the most hotly contested in palaeontology and revolves around an apparent gap in the fossil record immediately prior to the K-T boundary - the distinct layer of geological sediments separating the Cretaceous and Tertiary periods, and associated with a massive asteroid impact and global extinction event.

BBC: Closing the 'three metre gap'

Instead of separating the wheat from the chaff according to what layer it is found in, this relies on the different optical properties of the various inks, the mould and the parchment itself.

ECONOMIST: The Archimedes palimpsest