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| 21. | A small structure, such as a fibril of a nerve, that resembles a root. |
| 末梢象根的小构造，如神经末梢 |
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| 22. | A cup-shaped structure, such as the sucker of a tapeworm or leech. |
| 腹吸盘杯状的结构，如绦虫和寄生虫的嘴 |
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| 23. | An arm or a homologous anatomical structure, such as a flipper or wing. |
| 臂的同源结构臂或同源的解剖结构，如鳍状肢或翅膀 |
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| 24. | "cantilever:a projecting structure, such as a beam, that is supported at only one end." |
| 仅在一端被支撑的一个突出结构,如一段横梁. |
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| 25. | A sharp spiny part or structure, such as the spinous process of a vertebra. |
| 脊柱，椎骨脊突带尖刺的部位或结构，如脊椎动物的棘状突起 |
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| 26. | A girdlelike marking or structure, such as a band or ridge, on an animal. |
| 带，扣带，色带带状的标记或结构，如动物的带状条纹或脊 |
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| 27. | The den of certain animals, such as the dome - shaped structure built by beavers. |
| 巢动物的巢穴，如海狸造的一种穹顶的巢 |
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| 28. | A sheathlike structure, such as the leaf of a grass that surrounds a stem. |
| 叶鞘鞘状结构，例如一种围绕茎的草叶 |
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| 29. | A neck-shaped anatomical structure, such as the narrow outer end of the uterus. |
| 器官的颈部一种颈状解剖结构，如子宫末端狭窄的外端 |
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| 30. | A structure, such as a basin or reservoir, used for collecting or draining water. |
| 贮水池一种用于收集或疏导水的装置，如盆或贮水容器 |
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