单词：dorsal fin
dorsal fin的用法和样例：
例句
- The shark's fin sliced the water.鲨鱼的背鳍像刀样迅速划破水面。
- Now he speeded up as he smelled the fresher scent and his blue dorsal fin cut the water.那条鲨鱼闻到了新鲜的血腥味，正加速航行，蓝色的背鳍在水中划过。
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