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1·There is saying Courtesy demands reciprocity in China, and this saying just reflect that phenomenon.

中国有句俗语叫“礼尚往来”，正好反映了这一现象。

2·Courtesy demands reciprocity is the basic contact principle inherited from generation to generation in our life, and gift plays a critical role here.

在中国人的生活中，“礼尚往来”是传承久远的交往理念，“礼”在其中扮演着至关重要的作用。