中心: centre; centrum; centrality; ...环: ring; hoop结构: structure; composition; cons ...环结构: ring structure中心环: center piece; center ring; resist ring次循环结构: minor loop organization茎环结构: loop-stem structure; stem-loop structure令牌环结构: token ring architecture螺环结构: spiral structure循环结构: cycle structure; for loop structure; for-loop structure; looping structure脂环结构: alicyclic structure主次环结构: main minor loop organization主循环结构: major loop organization中心环节: key link芳基杂环结构: aromatic heterocyclic structure嵌套循环结构: nested loop structure循环结构型式: looconstruction万向节中心环: universal joint center ring; universal-joint center ring中心环感应法: central ring induction method闭环结构的确定: closed loop structure determination分支和循环结构: branche structure et cycle structure环结: long loops; looknot; open hand knot; ring connection角膜移植中心环: corneal transplant centering ring电子商务的中心环节（核心）: central to e-business中心环状脉络膜变性: central gyrate choroidal dystrophy
