reciprocity

n. 互惠主义，相互利益

recess, recession, recessional, recessionary, recessive, recharge, rechargeable, recherche, recidivism, recidivist, recipe, recipient, recipients, reciprocal, reciprocal pronoun, reciprocally, reciprocate, reciprocating, reciprocating engine, reciprocation, recital, recitation, recitative, recite, reckless, recklessly, recklessness, reckon, reckon on, reckon with, reckoner, reckoning, reclaim, reclamation, recline, recluse, reclusive, recognise, recognition, recognizable,