1
the estuary of [river]
The estuary of the Yangtze River is a vital ecosystem.
长江河口是一个重要的生态系统。
河口；入海口
先理解核心含义，再看它在真实句子里的用法。
河口；入海口
A coastal water body where a river meets the sea and fresh and salt water mix.
The estuary of the Yangtze River is a vital ecosystem.
长江河口是一个重要的生态系统。
海洋潮汐与河水交汇的沿海水域,形成咸淡水区
A coastal water body where ocean tides and river water merge, resulting in a brackish water zone.
河口,河流入海处的宽阔部分,淡水和海水混合。
the wide part of a river where it nears the sea; fresh and salt water mix
由淡水河流补给的海洋入口
An ocean inlet also fed by fresh river water.
The city built a bird-watching platform near the estuary where the river meets the sea.
这座城市在河流入海处的河口附近建了一个观鸟平台。
Many fish species use the estuary as a safe nursery for their young.
许多鱼类把河口当作幼鱼的安全栖息地。
The water in the estuary becomes brackish when the tide brings in salt water.
涨潮带来海水时，河口的水会变成半咸水。
The estuary of the Yangtze River is a vital ecosystem.
长江河口是一个重要的生态系统。
Many migratory birds live in the estuary.
许多候鸟生活在河口。
The Thames estuary is a major shipping route.
泰晤士河口是一条主要航道。
Not this
The ship entered estuary.
Use this
The ship entered the estuary.
Estuary 是可数名词，单数形式前需要加冠词（如 the），这是汉语中缺少冠词导致的常见错误。
Not this
The Mississippi River has a large estuary.
Use this
The Mississippi River has a large delta.
Estuary 指海水与淡水混合的河口，而 delta 指河流泥沙沉积形成的三角洲，两者地理特征不同，易混淆。
Not this
There are many estuary in the world.
Use this
There are many estuaries in the world.
Estuary 的复数形式是 estuaries，汉语没有复数变化，学习者常忘记加 -s 或变形式。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
河流河口
The river estuary is home to many species of birds.
河流河口是许多鸟类的栖息地。
潮汐河口
Tidal estuaries experience changes in water level twice a day.
潮汐河口每天经历两次水位变化。
河口入口
The estuary mouth is where the river meets the sea.
河口入口是河流与大海交汇的地方。
河口生态系统
The estuary ecosystem is sensitive to pollution.
河口生态系统对污染敏感。
沿海河口
Coastal estuaries serve as important nurseries for fish.
沿海河口是鱼类重要的育苗场。
Use estuary naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象东边水湾（east+uary），即河口，咸淡水交汇。
register: neutral; contexts: geography, environmental science; note_zh: 通常用于地理、环境科学等学术或正式语境，日常口语中较少使用。
复数形式为 estuaries。
Dictionary facts from ECDICT, WIKTIONARY.