1. Any of various primitive elongated freshwater or anadromous fishes of the family Petromyzontidae, characteristically having a jawless sucking mouth with rasping teeth. 
   七鳃鳗，八目鳗一种七鳃鳗科的原始细长淡水或溯河产卵鱼，特点是长有无颌的吮吸嘴，嘴内有锉牙
2. any voracious marine fish of the genus Sphyraena having an elongated cylindrical body and large mouth with projecting lower jaw and long strong teeth. 
   魣属的海生鱼，圆柱形细长身体，大嘴，颚突出，牙齿坚固。
3. African elephants only have four teeth to chew their food with. However, each tooth is 12 inches long, and their tusks are elongated teeth that grow throughout their lives, like fingernails. 
   非洲象只有四只牙齿用以咀嚼食物，但是每只牙长达12英寸，而且尖尖的象牙是延长的牙齿，就像指甲一样终生生长。
4. Any of several tropical American mammals of the family Myrmecophagidae, which lack teeth and feed on ants and termites, especially Myrmecophaga tridactyla, having an elongated, narrow snout, a long, sticky tongue, and an extended, shaggy-haired tail. 
   食蚁兽一种美洲热带食蚁科哺乳动物，没有牙齿，以蚂蚁和白蚁为食，尤其是三趾食蚁兽属有长而细的鼻子，长而粘的舌头和长毛蓬松的尾巴
5. Crouching start or elongated start. 
   是蹲踞式还是拉长式？

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