reciprocate

vt.

互换，互给；回报；

vi.

往复运动；互换；回报；互给

过去式：reciprocated过去分词：reciprocated现在分词：reciprocating第三人称单数：reciprocates

1. Some day I will reciprocate your kindness to me.
   总有一天我会报答你对我的恩德。
2. We always invite the neighbors and they never reciprocate!
   我们经常宴请邻居，可他们从来不报答我们。

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Trust among strangers in internet transactions: Empirical analysis of eBay' s reputation system