over·bur·den /-ˈbɝdṇ/
(vt.)裝載過多,負擔過多,使過勞
O·ver·bur·den v. t. To load with too great weight or too much care, etc.
O·ver·bur·den, n. The waste which overlies good stone in a quarry.
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overburden
n 1: the surface soil that must be moved away to get at coal
seams and mineral deposits
2: an excessive burden [syn: overload]
v 1: burden with too much work or responsibility
2: load with excessive weight