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a crater in/on [place]
crater 可指环形山、火山口或弹坑，具体含义根据语境判断。
Astronomers found a new crater on the far side of the moon.
天文学家在月球背面发现了一个新的环形山。
火山口
craters — plural of crater
先理解核心含义，再看它在真实句子里的用法。
火山口
a bowl-shaped geological formation at the top of a volcano
Astronomers found a new crater on the far side of the moon.
天文学家在月球背面发现了一个新的环形山。
陨石或其他物体撞击形成的半球形坑。
A hemispherical pit created by the impact of a meteorite or other object.
火山顶部的碗状地质构造
a bowl-shaped geological formation at the top of a volcano
火山口,火山主要喷发物由此涌出的盆状开口；也指间歇泉口,周围常堆积硅质锥形物。
The basin-like opening or mouth of a volcano, through which the chief eruption comes; similarly, the mouth of a geyser, about which a cone of silica is often built up.
南半球靠近长蛇座和乌鸦座的暗淡星座
a faint constellation in the southern hemisphere near Hydra and Corvus
We hiked to the edge of the crater and looked down at the steaming rocks.
我们徒步走到火山口边缘，俯视冒着热气的岩石。
The volcano's crater is filled with water from recent rain.
这座火山的火山口积满了最近下的雨水。
Scientists study the crater to understand past eruptions.
科学家研究这个火山口，以了解过去的喷发。
crater 可指环形山、火山口或弹坑，具体含义根据语境判断。
Astronomers found a new crater on the far side of the moon.
天文学家在月球背面发现了一个新的环形山。
用 of 结构强调火山口与山体的所属关系。
The crater of the volcano is visible from the village.
从村子里就能看到那座火山的火山口。
过去分词短语后置修饰 crater，可以说明其成因。
The crater formed by the impact is over a kilometer wide.
撞击形成的陨石坑宽达一公里多。
Not this
There are many crater on the moon.
Use this
There are many craters on the moon.
crater 是可数名词，被 many 等数量词修饰时必须用复数形式 craters，不能保持单数。
Not this
The meteor made crater in the ground.
Use this
The meteor made a crater in the ground.
crater 是可数单数名词，单独出现时需要加不定冠词 a/an，不能用零冠词直接作宾语。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
火山口
The volcanic crater was still releasing steam.
这个火山口仍在冒着蒸汽。
撞击坑
The impact crater on the moon is visible through a telescope.
月球上的撞击坑可以通过望远镜看到。
火山口湖
Crater Lake in Oregon was formed in a collapsed volcanic crater.
俄勒冈州的火山口湖是由塌陷的火山口形成的。
火山口边缘
We hiked along the crater rim to see the sunrise.
我们沿着火山口边缘徒步去看日出。
月球环形山
Tycho is a prominent lunar crater.
第谷是一座显著的月球环形山。
彻底失败的惨状；灾难性的局面
The scandal left his political career a smoking crater.
这桩丑闻让他的政治生涯彻底毁了，沦为一片废墟。
Use craters naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
crater 里藏着 rat（老鼠），想象老鼠掉进火山口那个碗状大坑里，由此记住 crater 就是火山口/大坑。
语域：neutral 常见场景：geology texts、news reports、travel guides 表示“火山口”时，crater 通常用于地理或地质相关描述，也常见于新闻报道和旅行介绍。该词属于中性的通用表达，正式与非正式语境都可以使用。
later、greater、cater、waiter、traitor 都与 crater 押韵，结尾均为 /eɪtər/；其中 later、greater、cater 还共享拼写片段 -ater。matter 拼写看似相近，但读 /ˈmætər/，元音是 /æ/，不押韵。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.