peripheral
adjective uk/pəˈrɪf.ər.əl/ us/pəˈrɪf.ɚ.əl/
次要的，附带的
Something that is peripheral is not as important as something else.
The book contains a great deal of peripheral detail. 该书包含了大量无关紧要的细节。
外围的，边缘的
happening at the edge of something
A figure came into my peripheral vision. 一个身影从远处映入我眼帘。
peripheral
noun [ C ] computing specialized uk/pəˈrɪf.ər.əl/ us/pəˈrɪf.ɚ.əl/
（计算机的）外围设备（如打印机）
a piece of equipment, such as a printer, that can be connected to a computer