Courtesy calls for reciprocity的意思|示意

礼尚往来 物以类聚，人以群分 Courtesy calls for reciprocity. 礼尚往来 Where there is life, there is hope.留得青山在，不怕没柴烧 .

投桃报李 陈词滥调老生常谈 cut and dried, 男士必需保藏：男士健身计划, 波胆比分, cliché 投桃报李 Courtesy calls for reciprocity. 留得青山正在不怕出柴烧 Where there is life, there is hope. .