equi·poise /ˈɛkwəˌpɔɪz, ˈi-/
  平衡,均衡(vt.)使平衡,使相稱,使相持不下
  E·qui·poise n.
  1. Equality of weight or force; hence, equilibrium; a state in which the two ends or sides of a thing are balanced, and hence equal; state of being equally balanced; -- said of moral, political, or social interests or forces.
     The means of preserving the equipoise and the tranquillity of the commonwealth.   --Burke.
  Our little lives are kept in equipoise
  By opposite attractions and desires.   --Longfellow.
  2. Counterpoise.
     The equipoise to the clergy being removed.   --Buckle.
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  equipoise
       n : equality of distribution [syn: balance, equilibrium, counterbalance]