backfill
verb uk/ˈbæk.fɪl/ us/ˈbæk.fɪl/
(MATERIAL)
[ I or T ]回填，重新填上（坑、沟等）
to fill a hole created by digging or drilling, especially using some of the material that has been taken out
Dig a large hole for the plant, then backfill with soil and compost. 给植物挖一个坑，然后用泥土和肥料回填。
Finally, backfill the trench. 最后回填深沟。
(JOBS)
[ T ]用新员工填补职位空缺
to replace workers after jobs have been made available
Chrysler says it intends to backfill jobs vacated by the buyouts. 克赖斯勒汽车公司宣布，在买断之后计划将招聘新的员工填补职位空缺。
backfill
noun [ U ] uk/ˈbæk.fɪl/ us/ˈbæk.fɪl/
回填土;回填料
material used to fill a hole that has been created by digging, etc.
Some of the fluorite produced from the lead mines was used as backfill underground. 铅矿产生的一部分萤石曾被用来作为地下回填材料。