loose gravel        
[der] ①砾。碎石。②片屑。屑。碎片。碎块。
split, loose gravel, (stone) chippings, (loose) chippings, crushed stone, grit

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[der] 。散砾石。修路候混着沥青砾。
grit, loose gravel

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[der] 散砾石。修路候混着沥青砾。
loose gravel, loose chippings