Hippocampus: The part of the limbic system that is involved in the acquisition of explicit memory.
海马：大脑边缘系统中与获得外显记忆有关的部分。
HIV: Human immunodeficiency virus, a virus that attacks white blood cells (T lymphocytes) in human blood, thereby weakening the functioning of the immune system; HIV causes AIDS.
人类免疫缺陷病毒：人体免疫缺陷病毒，一种攻击人体血液中的白细胞(T淋巴细胞)从而削弱免疫系统功能的病毒；这种病毒会引发艾滋病。
Homeostasis: Constancy or equilibrium of the internal conditions of the body.
内稳态：身体内部条件的平衡或者稳态。
Horizontal Cell: One of the cells that integrate information across the retina; rather than sending signals toward the brain, horizontal cells connect receptors to each other.
水平细胞：视网膜上整合信息的细胞之一；水平细胞不是向大脑发送信号，而是将受体彼此连接起来。