选词理由：既然聊到火车，我突然想到metro也是一个很有意思的单词有的人认识metro是因为地铁，有的人认识metro则是因为metropolitan就我本人而言，实际上很长时间都没有将这两个词联系起来。
直到有一次在上海坐地铁的时候，为了手机支付地铁票而下载了上海地铁App——Metro 大都汇，一个App的名字里，就包含了 metro 和 metropolitan，还是坐地铁的用的App，感觉很有意思！。
By the way，昨天有多少人是在地铁上看到推送的呢？
"Metro" is an English word that has several meanings, but it generally refers to a rapid transit system in an urban area, such as a subway or underground railway.
The word "metro" is derived from the French word "métropolitain," which means "metropolitan." "Métropolitain" was the name given to the Parisian subway when it opened in 1900. The Parisian subway was the first modern rapid transit system, and it served as a model for other cities to follow.
The word "métropolitain" is composed of two parts: "métro" and "politain." "Métro" is a shortened form of "chemin de fer métropolitain," which means "metropolitan railway." "Politain" is derived from the Greek word "polis," which means "city." Therefore, "métropolitain" means "city railway."
Other words with the same root or prefix as "metro" include:Metropolitan: relating to a large city and its surrounding areas
Metropolis: a large and busy cityMetonymy: a figure of speech in which a thing or concept is referred to by the name of something closely associated with it
Meteor: a small body of matter from outer space that enters the earths atmosphere and burns upother words with the same root or prefix as "polis":
Politics: the activities associated with the governance of a country or area, especially the debate between parties having power
Policeman/Policewoman: a member of a police force who is responsible for maintaining law and orderPolicy: a course or principle of action adopted or proposed by an organization or individual
Acropolis: a citadel or fortified part of an ancient Greek city, typically built on a hillNecropolis: a cemetery, especially a large one belonging to an ancient city
All of these words derive from the Greek word "polis," meaning "city." The word "polis" originally referred to a city-state in ancient Greece, which was a self-governing entity that included a city and its surrounding territory.
“Metro” 一词有多种含义，但通常指的是城市地区的快速交通系统，例如地铁或地下铁路“Metro”一词源自法语单词“métropolitain”，意为“大都市的”1900年巴黎地铁开通时被称为“métropolitain”。
巴黎地铁是第一条现代快速交通系统，也是其他城市效仿的榜样“Métropolitain”一词由“métro”和“politain”两部分组成“Métro”是“chemin de fer métropolitain”的缩写，意为“大都市铁路”。
而“politain”则源自希腊单词“polis”，意为“城市”因此，“métropolitain”即为“城市铁路”与“metro”相同根或前缀的其他单词包括：Metropolitan：与大城市及其周围地区有关的
Metropolis：一个大而繁忙的城市Metonymy：一种修辞方法，通过与其紧密相关的东西来指代一件事或概念的名称Meteor：外层空间的小物质体进入地球大气层并燃烧与“polis”相同根或前缀的其他单词包括：
Politics：与国家或地区治理相关的活动，尤其是掌权派之间的辩论Policeman / Policewoman：负责维护法律和秩序的警察队伍成员Policy：组织或个人采取或提出的行动方针或原则Acropolis：希腊古城的城堡或设防部分，通常建在山丘上
Necropolis：一个墓地，特别是属于古代城市的大墓地所有这些单词都来源于希腊单词“polis”，意为“城市”。“Polis”最初指的是古希腊的城邦，即包括城市及其周围领土的自治实体。
亲爱的读者们，感谢您花时间阅读本文。如果您对本文有任何疑问或建议，请随时联系我。我非常乐意与您交流。
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