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1.The hippocampus is a small, flat brain structure that plays a crucial role in memory formation.
海马是大脑中的一个小型扁平结构，它在记忆形成中起着至关重要的作用。
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2.In some species of mammals, the hippocampus is responsible for spatial navigation and learning.
在哺乳动物的某些物种中，海马负责空间导航和学习。
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3.Hippocampi have been found to be involved in emotions such as fear and anxiety.
海马被发现与恐惧和焦虑等情绪有关。