river
词根词缀：
词根
riv= stream 河流
derive v. 派生，得出
de 使… + riv 河流 + e → 使…如河流般延伸 → 派生，得出
river n. 河流，江，川
riv 河流 + er 表名词 → 河流，江，川
rivulet n. 小河
rivu〔= riv〕河流 + let 小 → 小河
数据来源：新东方英语词汇速记大全
相关例句：
This river is one li wide.
这条河有一里宽。
A river forms the boundary between the two countries.
一条河流成了两国的分界线。
The bridge was washed away by the swollen river.
桥给上涨的河水冲走了。
They forgot to apply the handbrake and the car rolled 60ft into the river.
他们忘了拉手刹，汽车翻滚了60英尺，掉进了河里。
We leaned on the wooden rail of the bridge and looked up the river
我们靠在桥的木栏杆上，朝河望去。
You could hike through the Fish River Canyon
你可以徒步穿越鱼河峡谷。