轰隆隆!电闪雷鸣。倾盆大雨落入小溪,小溪又汇入一条宽阔的河流,河流浩浩荡荡地流哇流,最后流入大海。当河流遇见海的瞬间,便深深地恋上了海,于是便有了河口。河口是河流流向海洋的必经之处。什么是河口?所谓河口,就是河流流入海洋、湖泊或者其他河流的地方。流入海洋的称为入海河口,流入湖泊(包括水库)的称为入湖河口,流入其他河流的称为支流河口。流入沙漠的河流,在途中会逐渐消失,称为无尾河,可以没有河口。河口地貌所研究的主要是入海河口,所以 Rumble! Thunder and lightning. Downpour falls into the creek, stream and into a broad river, the mighty stream flowing stream, and finally into the sea. When the river met the moment of the sea, they fell in love with the sea, so they have estuaries. The estuary is a must for rivers to flow to the sea. What is a river mouth? The so-called river mouth, is the river into the sea, lakes or other rivers. Into the sea called the estuary, into the lake (including reservoirs) called into the estuary, into other rivers known as the tributary estuary. The river flowing into the desert will gradually disappear on the way, called Wuwei River, without estuary. The main study of the estuary landscape is the estuary, so