名詞 estuary:

1. the wide part of a river where it nears the sea; fresh and salt water mix

1. The river opens out suddenly into a broad estuary.
   江面忽然開闊起來，形成一個寬廣的河。
2. A stretch of water in a river, an estuary, or a tidal channel made rough by waves meeting an opposing current.
   巨瀾在河流、港灣或潮汐海峽中，由波浪和它對立的水流相撞而成的一條綿延水域
3. The stream debouches into the estuary.
   這條河流入河口灣。
4. The ship has touched bottom the estuary must be shallower than we thought.
   船擱淺了--這河口的水比我們想像的要淺。

es.tu.ar.y

n.（名詞）
【復數(shù)】 es.tu.ar.ies
The part of the wide lower course of a river where its current is met by the tides.
港灣，河口灣：河流的低凹地區(qū)，在此水流與潮汐相遇
An arm of the sea that extends inland to meet the mouth of a river.
海灣：海洋伸進大路與河口相遇的分支

來源：
Latin aestu3rium
拉丁語 aestu3rium
from aestus [tide, surge, heat]
源自 aestus [潮汐，洶涌，發(fā)燒]

【引伸】
es.tuar.ial