名詞 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)
   同義詞：interchange, give-and-take

re.cip.ro.ca.tion

n.（名詞）
An alternating back-and-forth movement.
往復(fù)運(yùn)動(dòng)：交互地前后運(yùn)動(dòng)
The act or fact of reciprocating; interchange.
回報(bào)；互換：報(bào)答的行為或事實(shí)；交換