但是，哪种具有四肢的近亲及其特征导致了向无四肢的蛇的进化呢？
But which four-legged relatives and their family traits led the transition for legless snakes?
爬行动物，身体细长，体上有鳞，无四肢。种类很多，有的有毒，有的无毒。以蛙、鼠为食，大蛇亦吞食大兽类。
Reptiles, body slender, scaly body, no limbs. Many types, some toxic, some non-toxic. With frogs, rats for food, the serpent has swallowed a large animal.
这张图片来自费城穆特博物馆的收藏，展示一位无肢畸形的小姑娘，这一种疾病的特点是四肢未充分发育。
This image, from a collection at Philadelphia's Mutter Museum, shows a young girl with amelia, a condition marked by undeveloped limbs.
几天来，她就意识到了一种有加无减的魂不守体的感觉，仿佛她的四肢和肌肉系统仅仅构成了她躯体的居住背景。
She had been conscious for some days of an increasing sense of disembodiment, as if her limbs and musculature merely established the residential context of her body.
在这里，这三个门徒整理了那被损伤的四肢，将受伤的双手合抱在无脉的胸膛上。
There the three disciples straightened the mangled limbs, and folded the bruised hands upon the pulseless breast.
运动系统；四肢正畸形，关节无红肿，活动自如。
Mobility system: no deformation of four limbs, no red swelling of joint. Free movement.
运动使你使你四肢灵活，无疼痛，使肌肉、皮肤富有弹性，走路轻松。
Sports make you keep agility of four limbs and no pain, and you can have strong muscle and walk easily.
脊柱四肢：脊柱呈生理弯曲，无压痛及纵向叩击痛，四肢活动自如，肌力及肌张力正常。
Backbone and four limbs: physiological bending of backbone, no tenderness or vertical percussed pain. Free movement of four limbs. Normal muscle force and muscle strength.
无足蜥蜴属的蜥蜴；温带或热带地区四肢无力蚯蚓状蜥蜴，眼睛和耳朵隐蔽，尾巴短而硬。
A lizard of the genus amphisbaena; harmless wormlike limbless lizard of warm or tropical regions having concealed eyes and ears and a short blunt tail.
无足蜥蜴属的蜥蜴；温带或热带地区四肢无力蚯蚓状蜥蜴，眼睛和耳朵隐蔽，尾巴短而硬。
A lizard of the genus amphisbaena; harmless wormlike limbless lizard of warm or tropical regions having concealed eyes and ears and a short blunt tail.
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