overburden

名词 overburden:

1. the surface soil that must be moved away to get at coal seams and mineral deposits
2. an excessive burden
   同义词：overload

动词 overburden:

1. burden with too much work or responsibility
2. load with excessive weight

o.ver.bur.den

v.tr.（及物动词）
o.ver.bur.dened,o.ver.bur.den.ing,o.ver.bur.dens
To burden with too much weight; overload.
过重，超载：使负担过重；使装载过多
To subject to an excessive burden or strain; overtax.
过重的负担或压力；对…加以过重负担
n.（名词）

An excessive burden; an overload.
过重的负担；超载
Geology
【地质学】
Material overlying a useful mineral deposit.
覆盖层，超覆层：覆盖在有价值的矿石沉积物之上的物质
Sedimentary rock covering older crystalline layers.
沉淀岩：覆在旧的水晶状层之上的沉积岩石
Archaeology A sterile stratum overlying a stratum bearing traces of the culture being studied.
【考古学】 贫瘠的岩层：覆盖在有研究价值的文化层之上的废石土层