Encapsulation: a software object is a discretepackage containing both the physical properties (data) and the functionality (behavior) that mimics its real-world counterpart.
封装:软件对象就是包含模拟真实世界的对象的物理属性(数据)和功能(行为)的离散包。
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The paper discusses the two-error model demand function in ladder-like water pricing of residents living water usage—discrete continuous model, and proposes its algorithm and program in R package.