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名词互换
1. 互换：reciprocating engine 往复式发动机 | reciprocation 互换 | reciprocator 报答者
2. 往复,往返：reciprocating movement 往复运动 | reciprocation 往复,往返 | reciprocity 倒易性,可逆性
3. 往复运动：reciprocation 往复的 | reciprocation 往复运动 | reciprocationaction 往复动作
4. 往复的：reciprocatingtube 伸缩套管 | reciprocation 往复的 | reciprocation 往复运动
noun
1. mutual interaction
the activity of reciprocating or exchanging (especially information)
Synonym: interchange give-and-take
2. alternating back-and-forth movement
3. the act of making or doing something in return