The river opens out suddenly into a broad estuary.
江面忽然开阔起来，形成一个宽广的河。
A stretch of water in a river, an estuary, or a tidal channel made rough by waves meeting an opposing current.
巨澜在河流、港湾或潮汐海峡中，由波浪和它对立的水流相撞而成的一条绵延水域
The stream debouches into the estuary.
这条河流入河口湾.
