overburden

/,ouvə'bə:dn/
Noun
  1. an excessive burden
  2. the surface soil that must be moved away to get at coal seams and mineral deposits
Verb
  1. load with excessive weight
  2. burden with too much work or responsibility

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Từ chứa "overburden"

overburden
The workers must remove the overburden to reach the coal seam.