后段

posterior segment的用法和样例：

例句

In the Pth, its caudal region is larger than its rostral region, and the posterior segment in the caudal region is divided into the dorsal and the ventral cell populations.加厚区的尾侧端比吻侧端大，且尾端的后段分离成背侧和腹侧两个细胞群。
Conclusion Temporary keratoprosthesis used in the combined surgeries of anterior and posterior ocular segments is an effective method for treatment of severe ocular injuries.结论临时人工角膜下的眼前后段联合手术是目前治疗严重眼外伤病变的唯一有效的方法。

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abnormal release condition