脊柱弯曲现象还有脊柱前凸(会造成鞍背)和脊柱侧弯 脊柱后凸即驼背脊柱前凸其中腰部过分前凸称为鞍背) 鞍背是指局部某椎体被破坏,椎体突然向后凸起 腰部过于前凸的为鞍背生理胸曲消失者为直背 鞍背过度后凸成角的称为鞍背 在颅底内面观，鞍背为垂体窝后方的横位隆起
... 颈动脉沟（carotid sculcus） 鞍背（dorsum sellae） 前床突（anterior clinoid process） ...
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一百多年前，一些海员将他们不再需要的鞍背龟丢弃在了伊莎贝拉岛沃尔夫火山附近的班克斯湾。
More than a century ago, it turns out, sailors dumped saddle backed tortoises they did not need into Banks Bay, near Wolf Volcano on Isabela Island.
科考队正在寻找最典型的鞍背龟：龟壳前部像马鞍一样隆起，确保象龟伸出长长的脖子，吃到高大的仙人掌。
The teams were looking for tortoises with the most prominent saddlebacks: shells rising up in front, like saddles, to accommodate the animals' extremely long necks for grazing on tall cactuses.
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