reciprocation

n. 交互作用,交换,来往

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