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reciprocal
英/ɹɪsˈɪpɹəkəl/
美/ɹɪˈsɪpɹəkəɫ/
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01adj.
互惠的, 相互的, 相等的, 倒数的, 彼此相反的
concerning each of two or more persons or things; especially given or done in return
02n.
倒数, 互相起作用的事物
something (a term or expression or concept) that has a reciprocal relation to something else