rill       
noun [ C ] uk/rɪl/ us/rɪl/
 小河,小溪
a small stream
  The area is dotted with rills and rivers. 这个地区小溪和河流星罗棋布。 
 He loved tramping by rills and becks and over craggy rocks.  他喜欢在小溪和河床上行走,在崎岖的岩石上攀爬。 
 - More examples
 - The moorland rills were almost silent.
 - A number of rills run out from a pool in the centre of the garden.
 - A spiral of leaves uncoils with the slow-moving current of a dark country rill.