"risk is the reciprocal of safety"
"reciprocal aid" "reciprocal trade" "mutual respect" "reciprocal privileges at other clubs"
"the reciprocal ratio of a:b is b:a"
reciprocal是什么意思
reciprocally是什么意思
reciprocate是什么意思
reciprocation是什么意思
reciprocator是什么意思
reciprocitarian是什么意思
reciprocity是什么意思
recircle是什么意思
recirculate是什么意思
recirculation是什么意思