对于棘龙来说，饮食只是进化的冰山一角。
As for spinosaurus, diet was just the tip of the evolutionary iceberg.
方法观察了30个尸头和75侧干燥颅骨标本上鼻腔外侧壁结构，测量自前鼻棘至有关结构的长度和矢状角。
Methods the structures of the lateral nasal wall were observed on 30 cadaver head specimens and 75 dry half skulls.
目的比较寄生于家鸡小肠的棘盘瑞利绦虫和四角瑞利绦虫的形态特征及发育过程。
Objective To compare the morphological features and the development of Raillietina echinobothrida and R. tetragona from chicken.
目的比较寄生于家鸡小肠的棘盘瑞利绦虫和四角瑞利绦虫的形态特征及发育过程。
Objective To compare the morphological features and the development of Raillietina echinobothrida and R. tetragona from chicken.
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