over·bal·ance /ˌovɚ/
  (vt.)過重,價值超過,使失去均衡(vi.)失去平衡超過,不平均
  O·ver·bal·ance v. t.
  1. To exceed equality with; to outweigh.
  2. To cause to lose balance or equilibrium.
  O·ver·bal·ance n. Excess of weight or value; something more than an equivalent; as, an overbalance of exports.
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  overbalance
       v 1: weigh more heavily [syn: preponderate, outweigh, outbalance]
       2: out out of; "It is not desirable to overbalance the budget"