silt at the bottom of an estuary河口水底的淤泥We moored in the estuary, waiting for high tide.我们在港湾停泊, 等待涨潮....a damp, old castle, romantically sited on a river estuary.坐落在河湾之上的一座阴冷潮湿的古城堡，仿佛传奇中描述的一般We live near the Thames estua...
The stream debouches into the estuary.这条河流入河口湾.We live near the Thames estuary.我们的住处靠近泰晤士河入海口.We moored in the estuary, waiting for high tide.我们在港湾停泊, 等待涨潮....