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a/an [adjective] atoll
atoll 是可数名词，可用形容词说明其类型或特征。
The island is a coral atoll.
这个岛是一个珊瑚环礁。
环礁；环状珊瑚岛
atolls — plural of atoll
先理解核心含义，再看它在真实句子里的用法。
环礁；环状珊瑚岛
atoll
The island is a coral atoll.
这个岛是一个珊瑚环礁。
一种环状岛礁,由几乎或完全环绕泻湖的带状礁组成,礁坪上通常有一个或多个小岛。
A type of island consisting of a ribbon reef that nearly or entirely surrounds a lagoon and supports, in most cases, one to many islets on the reef platform.
由环绕潟湖的环形珊瑚礁构成的岛屿
an island consisting of a circular coral reef surrounding a lagoon
The small plane flew low over the atoll, giving us a clear view of the lagoon inside it.
那架小飞机低低地飞过环礁，让我们清楚地看到了里面的泻湖。
Many atolls in the Pacific Ocean are formed from volcanic islands that have sunk beneath the sea.
太平洋上的许多环礁是由沉入海面以下的火山岛形成的。
Divers explored the coral reef around the atoll and found dozens of tropical fish.
潜水员探索了环礁周围的珊瑚礁，发现了数十种热带鱼。
atoll 是可数名词，可用形容词说明其类型或特征。
The island is a coral atoll.
这个岛是一个珊瑚环礁。
表示“在环礁上”时，介词用 on。
They built a research station on an atoll.
他们在一个环礁上建了研究站。
用 in 引出环礁所在的海域或地区。
This is an atoll in the Pacific Ocean.
这是太平洋中的一个环礁。
Not this
There are many atoll in the Pacific Ocean.
Use this
There are many atolls in the Pacific Ocean.
atoll 是可数名词，复数形式为 atolls；中文“环礁”没有复数标记，所以学习者容易漏掉 -s。
Not this
She visited atoll last summer.
Use this
She visited an atoll last summer.
atoll 是单数可数名词，单独使用时前面需要加冠词 an；中文没有冠词，所以容易漏掉。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
珊瑚环礁
The diver explored the coral atoll.
潜水员探索了珊瑚环礁。
偏远环礁
They sailed to a remote atoll in the Pacific.
他们航行到太平洋一个偏远的环礁。
太平洋环礁
The Pacific atoll is home to many seabirds.
这个太平洋环礁是许多海鸟的家园。
环礁潟湖
The atoll lagoon is crystal clear and warm.
环礁潟湖清澈温暖。
形成环礁
Over millions of years, the sinking volcano formed an atoll.
数百万年来，下沉的火山形成了环礁。
比基尼环礁
The two-piece bathing suit called the bikini was named after Bikini Atoll, where the United States carried out nuclear tests in 1946.
被称为比基尼的两件式泳衣是以比基尼环礁命名的，美国于1946年在该环礁进行了核试验。
Use atolls naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
环礁 atoll 像甜甜圈：环形珊瑚礁围着中间泻湖，空中看像一枚蓝色戒指。
语域：neutral 常见场景：geography、marine science、travel 该词多用于地理或海洋相关话题，也常见于旅行描述，属于中性词汇，正式和日常场合都可以使用。
None of these words is a true rhyme with 'atoll' as given (/ˈæˌtɑl/), whose primary stress is on the first syllable. 'Doll' /dɑl/ is the closest to the final syllable /tɑl/ but the stress pattern differs. 'Toll', 'poll', 'roll', 'control', and 'patrol' are spelling lookalikes that all end in /oʊl/ in General American, not /ɑl/.
Dictionary facts from ECDICT, WIKTIONARY.