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swivel round/around
动词用法：swivel round/around 表示身体快速转动，常不带宾语。
He swivelled round to see who had entered the room.
他猛一转身，想看看谁进了房间。
转环；旋转接头
swivels — plural of swivel
先理解核心含义，再看它在真实句子里的用法。
转环；旋转接头
a coupling, as in a chain, whose one end turns on a headed pin
He swivelled round to see who had entered the room.
他猛一转身，想看看谁进了房间。
一种部件,如环或钩,通过销钉连接到另一部件上,使其能绕销钉轴线旋转。
A piece, such as a ring or hook, attached to another piece by a pin, in such a manner as to permit rotation about the pin as an axis.
一种小型火炮,可在支点或转轴上转动；也称旋转炮。
A small piece of ordnance, turning on a point or swivel; called also swivel gun.
旋转的动作。
The act of swivelling.
臀部的转动。
A rotating of the hips.
The office chair swivels easily so I can reach the printer without standing up.
这把办公椅可以轻松旋转，这样我不用站起来就能拿到打印机。
She swivelled the monitor toward me to show the graph.
她把显示器转过来给我看图表。
Please swivel your seat to face the window while we take off.
起飞时请把座椅转向窗户。
动词用法：swivel round/around 表示身体快速转动，常不带宾语。
He swivelled round to see who had entered the room.
他猛一转身，想看看谁进了房间。
动词用法：宾语后接方向状语，表示转动某物使其朝向某处。
She swivelled the screen towards the audience.
她把屏幕转向观众。
名词用法：on a swivel 表示装在可水平转动的转环/转轴上，也可构成 swivel chair（转椅）等复合词。
The camera is mounted on a swivel.
相机安装在转环上。
Not this
He swiveled the cap off the bottle.
Use this
He twisted the cap off the bottle.
swivel 指绕固定轴心旋转（如椅子或身体），而拧开瓶盖是螺旋形转动，应用 twist，不该用 swivel。
Not this
I need a swiveled chair for my desk.
Use this
I need a swivel chair for my desk.
swivel chair 是固定搭配（名词+名词），意为“转椅”；swiveled 是过去分词，表示“被转动的”，不能作“可旋转的”定语用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
转椅
He leaned back in his swivel chair and closed his eyes.
他靠在转椅上闭上了眼睛。
旋转接头
The camera arm uses a swivel joint for easy positioning.
相机臂使用旋转接头，方便调整位置。
旋转底座
The monitor is mounted on a swivel base.
显示器安装在旋转底座上。
转身；转动
She swivelled around to see who was calling her name.
她转过身去看是谁在叫她的名字。
转过头
He swivelled his head to watch the bird fly away.
他转过头去看鸟飞走。
保持警惕，眼观六路
In this neighborhood, you'd better keep your head on a swivel.
在这个街区，你最好保持警惕，时刻留意四周。
（因激动或愤怒而）瞪着眼的；神色狂野的
The man gave a swivel-eyed stare and then laughed wildly.
那个男人瞪着双眼，神色狂野，然后狂笑起来。
Use swivels naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
转椅底座有个swivel转环，看到它就想象椅子一转、人跟着转，swivel就是‘旋转接头’。
语域：mixed 常见场景：机械与五金、家具与产品说明、技术手册 作名词时多用于机械、五金或家具等说明性语境，比较常见于产品描述和技术手册；口语中常出现在固定搭配（如 swivel chair）里。
与 swivel /ˈswɪvəl/ 同韵（/ɪvəl/）：civil、drivel、snivel。注意拼写相似但读音不同：rival /ˈraɪvəl/、naval /ˈneɪvəl/、shovel /ˈʃʌvəl/，它们不押韵。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.