grasses with creeping stems that root freely; a pest in lawns
同义词：crab grass, finger grass
crabgrass详细解释
crabgrass 或 crab grass n.（名词）Any of certain grasses of the genusDigitaria, especially D. sanguinalis or D. ischaemum, widely naturalized in North America. 马唐：任一种马唐属 的禾草，尤指广泛生长于北美洲的 马唐 或 止血马唐
