为了提高系统的易移植性，通常采用硬件抽象层(Hardware Abstraction Level，HAL)和板级支撑包(Board Support Package，BSP)的底层 设计技术。
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This means that a program using a vector graphics system is a level of abstraction away from the hardware.
这意味着用适量图形系统的程序在一定水平上远离硬件。
To some folks, ESL (electronic system level) means designing at a very high level of abstraction prior to making any hardware-software portioning decisions.
对于一些人来说，ESL是指在做任何软硬件部分的决定之前的一个非常高的抽象层次的设计。
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