Overburden

[əʊvə'bɜːd(ə)n]

解释:

(noun.) the surface soil that must be moved away to get at coal seams and mineral deposits.

(verb.) burden with too much work or responsibility.

(verb.) load with excessive weight.

整理:塞尔瓦托--From WordNet

解释:

(v. t.) To load with too great weight or too much care, etc.

(n.) The waste which overlies good stone in a quarry.

录入:鲁道夫

解释:

v.t. to burden overmuch.—n. alluvial soil overlying a bed of ore.

整理:马库斯