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
海洋潮汐与河水交汇的沿海水域,形成咸淡水区；河口,河流入海处的宽阔部分,淡水和海水混合。；由淡水河流补给的海洋入口；港湾
A coastal water body where a river meets the sea and fresh and salt water mix.
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。
用法提示：estuary是名词，指河流与海水交汇的河口地带。
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。
用法提示：estuary为单数名词，在此表示河口生态区域。
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。
用法提示：estuary是名词，指受潮汐影响的河口。
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。
inlet 范围更广，可泛指任何狭长水域，不一定是河口；estuary 特指河流入海处淡咸水混合段。
firth 主要用于苏格兰，常与 estuary 互换，但地域性强。
creek 在潮汐语境下可指与海相连的狭窄水道，但通常规模较小，且常指溪流，需注意语境。
grammar · medium
易错句子The ship entered estuary.
正确表达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。
grammar · medium
易错句子The Mississippi River has a large estuary.
正确表达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。
grammar · medium
易错句子There are many estuary in the world.
正确表达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。
河口是河流入海处，其反义词为河流的发源地。
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。
estu- (root: tide) + -ary (suffix: place of)
河口是河流与海洋的交汇处。
潮汐影响河口水位和盐度。
河口区是淡水和咸水混合的半咸水环境。
河口常发育有潮汐沼泽湿地。
河流沉积物在河口形成三角洲。
Dictionary facts from ECDICT, WIKTIONARY.