| 单词 | 已退化 |
| 释义 | 〔capybara〕A large semiaquatic rodent(Hydrochoerus hydrochaeris) of tropical South America, having short limbs and a vestigial tail and often attaining lengths of more than 1.2 meters (4 feet). 水豚：一种巨大的半水栖啮齿动物（水豚） ，产于南美洲的热带地区，四肢短小，尾已退化，身体长达1.2米（4英尺） 〔shipworm〕Any of various wormlike marine mollusks of the generaTeredo and Bankia, having rudimentary bivalve shells with which they bore into wood, especially the submerged timbers of ships and wharves, often doing extensive damage. 船蛆，凿船虫：各种长得象蠕虫的船蛆属 和 节铠船蛆属 海洋软体动物中的任何一种，有已退化的双壳，它们用双壳在木头上钻孔，尤其是船只和码头浸在水下的木材，经常造成巨大的破坏 〔kittiwake〕Either of two cliff-nesting gulls(Rissa tridactyla or R. brevirostris) of northern regions, having a rudimentary hind toe. 三趾鸥：后趾已退化的在悬崖筑巢的鸥（三趾鸥 或 红脚三趾鸥） ，居住在北部地区 |
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