HSK 7-9
礼尚往来
lǐshàngwǎngláilit. proper behavior is based on reciprocity (idiom); fig. to return politeness for politeness
邻里相处讲究礼尚往来。
Línlǐ xiāngchǔ jiǎngjiu lǐshàngwǎnglái.
Good relations between neighbors call for reciprocal courtesy.
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Appears across levels (7-9) in the HSK 3.0 word list.