UECU软件静态结构由硬件封装层、中间层和应用层组成。
Static structure of UECU software consists of hardware encapsulation layer, modicum layer, and application layer.
操作系统的目的之一就是把底层硬件的特性给封装起来，然后提供一个统一的接口，以便于计算机操作人员控制硬件。
The purpose of the OS is to encapsulate all the intricacies of the underlying hardware and provide a unified access interface to the computer's parts. No application can access the hardware directly.
制造商不愿意把所有这些接口都放到智能手机上，因为有些设计是必须保证的，诸如保持硬件耐用性和尽可能小的封装。
Manufacturers are hesitant to incorporate all of these interfaces on a smartphone because of design obligations such as maintaining hardware durability and a small footprint.
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