Longest dorsal spine 背鳍最长硬棘
thoracic spine dorsal spine 胸脊椎
dorsal fin spine 鑳�槌�妞
An enlarged dorsal spine accommodates additional avionic for the second pilot.
放大以适应增加的武器装备和第二位飞行员。
Their most distinctive feature, worn only by females, is a piece of dorsal spine that protrudes above their mouths like a fishing pole—hence their name.
只有雌性安康鱼的背部才长有的一根尖刺是雌鱼最大的特征，这根刺在鱼嘴上方伸出，就像一根钓鱼竿---安康鱼由此得名。
It thumps the catch against the branch to stun it-a lesson some young birds learn only after swallowing a stickleback that erects its dorsal spine on the way down.
然后它会在树枝上把鱼摔死——当小鸟能够顺着鱼的背脊吞下一只棘鱼时，才会学习这个技能。
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