Additionally, air sinuses, presumably filled with spongelike tissues, had formed around the middle ear, offering better sound resolution and directional cues for underwater hearing.

  • 此外,牠们的中耳附近出现了气窦,也许其中充满了海绵组织,使牠们的水中听觉无论是解析度还是方向感都提升了。
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