recitaln.背诵;吟诵;详述n.独奏会;独唱会
reciprocaladj.互惠的;相互的;互补的n.相互;互惠;[数]倒数
reciprocate for回报 ...报答 ...
reciprocate with报答酬谢与 ... 交换
reciprocate casing上下活动套管
reciprocate in line直线往复式
"We always invite the neighbors and they never reciprocate!"
"the engine reciprocates the propeller"