短语词组短语ground -litter 地被物;枯枝层ground indicator litter 枯枝落叶层ground d litter 枯枝落叶层litter the ground 把垃圾扔到地上Litter The Ground With Paper 乱扔纸屑Don 't litter the ground 不要随地扔纸屑 返回 ground litter