Rio de Janeiro（里约热内卢）的字面意思是“一月的河”

在拉丁语系rio表“河”。也就是说，至少在法语、意大利语、西班牙语和葡萄牙语中都表示“河”，相当于英语中的river：

river[5rivE]n.河, 江（riv+er）

源自中古英语rivere。

去掉后缀和rio也只是一个字母之差。

janeiro相当于英语中的January：

January[5dVAnjuEri]n.一月(略作Jan)（Janu+ary）

Janu是Janus的变化：

Janus[5dVeinEs]n.【罗神】坚纽斯门神(掌管门户出入与水陆交通)

双面联胎【讯】双向天线;【天】土卫一(Jan(u)+us)

-us拉丁语表“阳性、单数”后缀

我们可以看出来Janeiro和January开头是一样的，不同的只是后缀。所以，您绝对不可以把Janeiro分解成J,a,n,e,i,r,o。

在拉丁语系-o多数是表“阳性、单数”后缀。

也就是说如果您已经掌握英语中的January，再记葡萄牙语中的janeiro就相当容易:

janeiro 

[P]  janeiro (m)

[E]  January [dʒ'ænjuəri] (n)

[C]  一月

英语发音：/ˈriːoʊ deɪ ʒəˈnɛəroʊ/ or /ˈriːoʊ dɪ dʒəˈnɛəroʊ/

葡萄牙语发音：

Rio de Janeiro

[ˈʁi.u dʒi ʒaˈnejɾu]

里约热内卢（葡萄牙语：Rio de Janeiro，意即“一月的河”），有时简称为里约（Rio），位于巴西东南部，在1960年以前为巴西首都，是巴西第二大城市，仅次于圣保罗，东南濒临大西洋，海岸线长636公里。里约热内卢属于热带干湿季气候，终年高温，一年中有明显的干季与雨季。市境内的里约热内卢港是世界三大天然良港之一，里约热内卢基督像是该市的标志，也是世界新七大奇迹之一。里约热内卢于2009年10月2日，获得2016年第31届夏季奥林匹克运动会举办权。
https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Marina_da_Gl%C3%B3ria_1.jpg/800px-Marina_da_Gl%C3%B3ria_1.jpgde Janeiro（里约热内卢）的字面意思是“一月的河”" />
https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/Praia_de_Copacabana_-_Rio_de_Janeiro,_Brasil.jpg/800px-Praia_de_Copacabana_-_Rio_de_Janeiro,_Brasil.jpgde Janeiro（里约热内卢）的字面意思是“一月的河”" />

https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Rio_de_Janeiro_night.jpg/800px-Rio_de_Janeiro_night.jpgde Janeiro（里约热内卢）的字面意思是“一月的河”" />

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Rio de Janeiro (pron.: /ˈriːoʊ deɪ ʒəˈnɛəroʊ/ or /ˈriːoʊ dɪ dʒəˈnɛəroʊ/; Portuguese pronunciation: [ˈʁi.u dʒi ʒaˈnejɾu],^[1] January River), commonly referred to simply as Rio,^[2] is the capital city of the State of Rio de Janeiro, the second largest city of Brazil, and the third largest metropolitan area and agglomeration in South America, boasting approximately 6.3 million people within the city proper,^[3][4] making it the 6th largest in the Americas, and 26th in the world.^[5]

metropolitan[metrE5pRlIt(E)n]adj.首都的, 主要都市的, 大城市（metro+polit+an）

metropolis[mI5trRpElIs]n.首都, 主要都市, 都会, 大主教教区, 大城市(metro+polis)

agglomeration[E7^lCmE5reiFEn]n.凝聚; 团矿; 结块; 团聚作用; 烧结作用; 加热粘结

agglomerate[E5^lCmEreit]n.大团, 大块adj.成块的, 凝聚的vt.

使成团, 使成块, 使凝聚vi.成团, 成块, 凝聚（ag+glom+er+ate）

源自拉丁语agglomerāe  agglomerāt- [聚在一起]

glom[^lCm]vt.<</SPAN>俚>偷, 抢, 看, 瞪

Rio de Janeiro has become a home of a World Heritage Site named "Rio de Janeiro: Carioca Landscapes between the Mountain and the Sea", as granted by UNESCO on 1 July 2012 in the category Cultural Landscape.^[6]

carioca n. （巴西的）卡里奥克舞

Carib[5kArIb]n.加勒比人(南美洲东北部印第安人)

The city was the capital of Brazil for nearly two centuries, from 1763 to 1815 during the Portuguese colonial era, 1815 to 1821 as the capital of the United Kingdom of Portugal, Brazil and Algarves, and 1822 to 1960 as an independent nation. Rio is nicknamed the Cidade Maravilhosa or "Marvelous City".

The 2016 Summer Olympics and the Paralympics will take place in Rio de Janeiro, which will mark the first time a South American or a Portuguese-speaking nation hosts the event.

It will be the third time the Olympics will be held in a Southern Hemisphere city, and it will mean Australia will no longer be the only Southern Hemisphere country to have hosted the Olympics.^[11]

southern hemisphere n.南半球

On 12 August 2012, at the 2012 Summer Olympics closing ceremony, Mayor Eduardo Paes received the Olympic Flag, via Jacques Rogge, from London Mayor Boris Johnson.

Rio's Maracanã Stadium also held the final of the 1950 FIFA World Cup and will host the final match of the 2014 FIFA World Cup.^[12] Rio de Janeiro will also host World Youth Day in 2013.^[13