rill

名词 rill:

1. a small stream
   同义词：rivulet, run, runnel, streamlet
2. a small channel (as one formed by soil erosion)

1. The water in this rill is very clean.
   这条小溪里的水非常清澈。

rill 也作 rille

n.（名词）
A small brook; a rivulet.
小溪，小河
A long, narrow, straight valley on the moon`s surface.
（月面）谷，沟纹：月球表面上狭长而垂直的峡谷

来源：
Low German rille
低地德语 rille
or Dutch ril [running stream] * see rei-
或 荷兰语 ril [流动的河流] *参见 rei-