by head butting. 相互撞头攻击

45. On the surface of this sea fan, there are two polyps that are not polyps.
    在这株海扇上,有2只"珊瑚虫"不像珊瑚虫
46. They're pygmy sea horses, the world's smallest, less than two centimeters high.
    豆丁海马--全世界最小的海马,身长不到两公分
47. They are males, settling a territorial dispute,
    这2只雄性豆丁海马正在为争夺领地
48. by head butting.
    相互撞头攻击
49. An electric flash?
    电光灯?
50. No, the display of a file clam.
    当然不是,这是火蛤蜊在表演
51. Perhaps this extraordinary pulsation of the clam's fleshy mantle
    蛤的肉质外壳的这种非常特别的规律性闪电

来自《行星地球 第一季 第九集 Planet Earth S01E09 海洋》第 48 行