设(R,+,·)为环，若S是R的一个非空子集，且(S,+,·)也是环，则称(S,+,·)为(R,+,·)的子环。
算子环 ring of operators ; ring with operators ; [数] operator ring
整流子环 [电] commutator ring
电子环加速器 [核] electron ring accelerator
反密码子环 anticodon loop
妨碍生产的卡脖子环节 bottleneck
定子环 stator ring
数子环 subring
单频氩离子环形激光器 single-frequency argon ion ring laser
李子环 lie subring
四合院由花园和保护的高墙构成，花园被四个房子环绕着。
A single implementation of Si He Yuan comprises of garden surrounded by four houses and protected by high walls.
有人发抖喘息，因为这是个极端的女才子环境。
There were shudders and gasps, for the environment was blue-stocking in the extreme.
梳子环保屋在去年开罗的马尔凯国际博览会展出。
The Komb House was presented at the Le Marche exhibition in Cairo last year.
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