Tests can be categorized according to the amount of code they exercise: a unit test verifies the functionality of a single software component, such as a function or a class.
可以将测试按照测试代码的多少分类：“单元测试”检验单一组件的功能，比如一个函数或者一个类。
In PCI system, the signals of each PCI slot in a PC main board are only enough for a single PCI component, which limits the function extension.
PCI系统结构中，计算机主板上每个PCI插槽所提供的信号只能直接连接一个PCI元件，这样限制了PC I板卡的功能扩展。
The function, component, planning and layout of a single airport system is analyzed.
分析单个机场系统的功能、组成及其规划内容。
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