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hù tōng yǒu wú

ㄏㄨˋ ㄊㄨㄥ ㄧㄡˇ ㄨˊ
Phr
1(idiom) mutual exchange of assistance; to benefit from each other's strengths and make up each other's shortfalls; to reciprocate with material assistance; to scratch each other's back

Characters

互通有无