(每日一词）reciprocity

Reciprocity /ˌres.ɪˈprɑː.sə.t̬i/ n. 互助；互惠；互换

meaning: behavior in which two people or groups of people give each other help and advantages

词源：rec- 表示re- 往回

词源：proc-表示pro-向前

后缀：-ity 名词后缀

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铅笔英语