sand hopper

1. In the hopper sedimentation models, it estimated the density of sand bed in the hopper, undisturbed settling velocity.
   泥舱沉积模型中估算了泥舱内的沙床密度，未受扰动的沉降速度。

noun

1. small amphipod crustaceans that hop like fleas

   Synonym:    beach fleasandhoppersand flea