1
the Caspian
此处“Caspian”为名词，指里海，是“the Caspian Sea”的省略形式，通常带定冠词。
The Caspian is the largest inland body of water in the world.
里海是世界上最大的内陆水体。
里海
先理解核心含义，再看它在真实句子里的用法。
里海
the Caspian Sea
The Caspian is the largest inland body of water in the world.
里海是世界上最大的内陆水体。
里海沿岸国家的居民
A person from a country that borders the Caspian Sea.
The Caspian coast has become a popular destination for birdwatchers.
里海沿岸已成为观鸟者喜爱的目的地。
Local fishermen rely on the Caspian waters for their daily catch.
当地渔民依靠里海水域获取每日渔获。
This rare bird migrates to the Caspian wetlands every autumn.
这种珍稀鸟类每年秋天都会迁徙到里海湿地。
此处“Caspian”为名词，指里海，是“the Caspian Sea”的省略形式，通常带定冠词。
The Caspian is the largest inland body of water in the world.
里海是世界上最大的内陆水体。
此处“Caspian”为形容词，意为“里海的”，置于名词前作定语。
The Caspian Sea is shared by five countries.
里海由五个国家共享。
Not this
Caspian Sea is the largest inland body of water in the world.
Use this
The Caspian Sea is the largest inland body of water in the world.
海洋、湖泊、河流等专有地理名词前通常要加定冠词 the。the Caspian Sea 是固定名称；中文里没有冠词，所以容易漏用 the。
Not this
The Volga River flows in the Caspian Sea.
Use this
The Volga River flows into the Caspian Sea.
动词 flow 表达“流入”时，与 into 搭配，表示从外部进入内部；in 只能表示“在……内部”，没有方向性。中文“流入”常被误拆为“流+在”，因此需要改为 into。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
里海
The Caspian Sea is the largest inland body of water in the world.
里海是世界上最大的内陆水体。
里海地区
Oil and gas are abundant in the Caspian region.
里海地区石油和天然气储量丰富。
里海沿岸
Many resort towns line the Caspian coast.
许多度假城镇分布在里海沿岸。
里海盆地
The Caspian basin has a rich history of trade.
里海盆地有着丰富的贸易历史。
里海海豹
The Caspian seal is one of the few seal species living in inland waters.
里海海豹是少数生活在内陆水域的海豹物种之一。
里海虎
The Caspian tiger is now extinct.
里海虎现在已经灭绝。
我是凯斯宾，凯斯宾之子。
In C.S. Lewis's Prince Caspian, Prince Caspian says this when he meets Peter, the High King of Narnia.
在 C.S. 刘易斯的《凯斯宾王子》中，凯斯宾王子在见到纳尼亚至尊王彼得时说了这句话。
Use Caspian naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
caspian 音似“卡斯皮安”，想象一位叫卡斯的人住在里海边；里海是世上最大的咸水湖。
语域：neutral 常见场景：geographical descriptions、news reporting、formal writing Caspian 通常作形容词，表示“里海的”，多用于地理、新闻等中性或正式语境，常见搭配如 Caspian Sea。
所列词均不与 Caspian /ˈkæspiən/ 同韵，只是拼写都以 -ian 结尾；注意 Asian /ˈeɪʒən/、Russian /ˈrʌʃən/、Persian /ˈpɜːrʒən/ 等的读音与拼写差异较大。
Dictionary facts from ECDICT, WIKTIONARY.