peripheral
音标：
美音：/pəˈrɪfərəl/，英音：/pəˈrɪfərəl/
听听基本释意：
外刊例句：
The radial nerve is part of the peripheral nervous system.
桡神经是周围神经系统的一部分。
—Washington Post
In the next phase, as he has called it, he could do with chipping away some peripheral figures to make way for some stellar operators.
在下一阶段，正如他所说，他可以去掉一些外围人物，为一些明星运营商让路。
—BBC
Isha Ambani’s leadership role is also in stark contrast to the largely peripheral role that other women from her family have played in the core business until now.
伊莎·安巴尼 (Isha Ambani) 的领导角色也与其家族中的其他女性迄今为止在核心业务中扮演的主要外围角色形成鲜明对比。
—BBC
基本释意：
adjective
on or near an edge or constituting an outer boundary; the outer area
adj. 次要的，附带的；外围的，周边的；（计算机设备）外围的；（剖）体表的；周围神经系统的，末梢的
同义词：
computer peripheral,peripheral device
短释义：
Scanners, printers, and speakers are peripheral devices for a computer because they aren’t central to the working of the computer itself. Anything peripheral is on the margin, or outside, while main things, like a computer’s processor, are not peripheral.
扫描仪、打印机和扬声器是计算机的外围设备，因为它们不是计算机本身工作的核心。任何外围设备都在边缘或外部，而主要的东西，如计算机的处理器，都不是外围设备。
长释义：
Outside of computer jargon, peripheral is a common term in eye exams, which measure peripheral vision to see how far toward the outer right and left edges you can see. Peripheral also describes nerves from the body’s peripheral system, which are secondary to the main system but branch off of it — like the wires between peripheral devices and a computer.
在计算机术语之外，周边是眼科检查中的一个常用术语，它测量周边视力以查看您可以看到向右外边缘和左边缘的距离。外围系统还描述了来自身体外围系统的神经，这些神经从属于主要系统，但从它分支出来——就像外围设备和计算机之间的电线一样。
文学例句：
I’m not looking directly at him, but I can see him in my peripheral vision.
我没有直视他，但我可以用余光看到他。
—Water for Elephants by Sara Gruen
I saw him in my peripheral vision as Sahil and I stared at each other.
当萨希尔和我对视时，我在余光中看到了他。
—From Twinkle, with Love by Sandhya Menon
Cecilia’s left hand was cupped above her cheek, presumably to exclude him from her peripheral vision.
塞西莉亚的左手托在她的脸颊上方，大概是为了把他从她的周边视线中排除。
—Atonement by Ian McEwan
词源：
peripheral (adj.)1803, "of, belonging to, or situated on the periphery," from periphery + -al (1). Earlier formations were peripherial (1670s); peripherical (1690s). Related: Peripherally. As a noun, peripherals, "peripheral devices of a computer," is by 1966.Related entries & more
下面是词源的翻译（机器翻译比较难翻，参考着看）
peripheral (adj.)1803，“属于、属于或位于外围”，来自 periphery + -al (1)。早期的地层是外围的（1670 年代）；周边（1690 年代）。相关：周边。作为名词，外围设备，“计算机的外围设备”，于 1966 年出现。相关条目及更多
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