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eastern [noun]
eastern 直接修饰名词，表示方位。
The eastern region of the country is known for its mountains.
该国的东部地区以山脉闻名。
东部的；东方的
easternmost — superlative of eastern
先理解核心含义，再看它在真实句子里的用法。
东部的；东方的
lying toward or situated in the east
The eastern region of the country is known for its mountains.
该国的东部地区以山脉闻名。
指方位或位置在东部，如东部地区、东海岸。
东方的；朝东的；位于东部的
Of, facing, situated in, or related to the east.
(根据惯例或说话者角度)被指定为东方的地区。
Of a region designated as the East by convention or from the perspective of the speaker or author.
从东方吹来的；东风的
Blowing from the east; easterly.
源自东罗马帝国教会的基督教会。
Of the Christian churches originating in the church of the Eastern Roman Empire.
The eastern sky turned bright orange just before sunrise.
日出前，东方的天空变成了亮橙色。
We spent the afternoon walking along the eastern shore of the lake.
我们一下午都沿着湖的东岸散步。
The easternmost island in the group has a small fishing village.
这群岛中最东端的岛上有一个小渔村。
eastern 直接修饰名词，表示方位。
The eastern region of the country is known for its mountains.
该国的东部地区以山脉闻名。
用定冠词the，后接名词和of短语。
Shanghai is located in the eastern part of China.
上海位于中国东部。
用于专有名词时，Eastern通常大写。
Eastern Europe has a rich cultural history.
东欧有丰富的文化历史。
Not this
The sun rises in the eastern.
Use this
The sun rises in the east.
方向名词如east、west等作介词宾语时用名词形式，而eastern是形容词，不能直接用作宾语。
Not this
I visited Eastern China last year.
Use this
I visited East China last year.
地理区域专有名词如East China使用名词east作定语，而非形容词eastern，这是固定表达。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
东部
The eastern part of the country is mountainous.
该国东部多山。
东部地区
The eastern region experiences heavy rainfall.
东部地区降雨量很大。
东海岸
They live on the eastern coast of the island.
他们住在该岛的东海岸。
东欧
She traveled to eastern Europe last summer.
她去年夏天去了东欧旅行。
Use easternmost naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想'east'（东方）+ 'ern'（表示方向的形容词后缀），想象太阳从东方升起，'eastern'就是'东方的'。
常用于地理方位和描述东方事物，语气中性，适用于多种语境。
These words share the spelling '-ern' but do not rhyme with 'eastern' /ˈiːstən/ because their stressed vowels differ. For example, 'western' /ˈwestən/ has a different first vowel. Use them to practice the common spelling pattern.
Dictionary facts from ECDICT, WIKTIONARY.