| 单词 | four-membered |
| 例句 | They obtained four-membered rings in good yields and with excellent enantioselectivity. [Perspective] A Two-Catalyst Photochemistry Route to Homochiral Rings 2014-04-29T14:56:12.328Z True ring systems, which possess the characters of organic nuclei, do not come into existence in three-and four-membered rings, their first appearance being in penta-atomic rings. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" The double door frame projects pilaster-like, with a four-membered cornice above, from which rises an elliptical arch, with an elliptical cornice about a foot above. The Old Franciscan Missions Of California |
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