How your brain tells you where you are

1*hippo·cam·pus      n.  /ˌhɪpəˈkæmpəs/    ( pl. hippo·campi/‑paɪ/  /‑pi/  )

( anatomy 解) either of the two areas of the brain thought to be the centre of emotion and memory 海马（大脑中被认为是感情和记忆中心的部分）

2*organ      n./ˈɔːɡən/  

（1）.a part of the body that has a particular purpose, such as the heart or the brain; part of a plant with a particular purpose （人体或动植物的）器官

•the internal organs 内脏

•the sense organs (= the eyes, ears, nose, etc.) 感觉器官

•the sexual/reproductive organs 性╱生殖器官

•an organ transplant/donor 器官移植╱捐赠者

（2）.( especially humorous) a penis 阴茎；阳物

（3）.( also ˈpipe organ ) a large musical instrument with keys like a piano. Sounds are produced by air forced through pipes. 管风琴

•plays the organ 

•organ music 管风琴曲

——compare harmonium（脚踏式风琴，小风琴）

（4）.a musical instrument similar to a pipe organ , but without pipes 风琴

•an electric organ 电子琴

——see also barrel organ（手摇风琴，筒风琴） mouth organ（口琴）

（5）.( formal ) an official organization that is part of a larger organization and has a special purpose （官方的）机构，机关

•the organs of government 政府机关

（6）.( formal ) a newspaper or magazine that gives information about a particular group or organization; a means of communicating the views of a particular group 机关报刊；（某团体的）宣传工具

•The People's Daily is the official organ of the Chinese Communist Party. 《人民日报》是中国共产党的官方报纸。