[riˌsiprə'keiʃən]
reciprocation
n. 报答,互换,往复运动

英英解释:

名词 reciprocation:

  1. the act of making or doing something in return
  2. alternating back-and-forth movement
  3. mutual interaction; the activity of reciprocating or exchanging (especially information)
  4. 同义词:interchange, give-and-take