Thereisacommon,usuallyroundobjectthatyoucanseeeverydaya...
问题详情：Thereisacommon,usuallyroundobjectthatyoucanseeeverydayanditappearsinmanyexpressions—buttons!Buttons,whicharemadeofmetalorplastic,arefoundonallsortsofclothing.Theyfastenorconnectonepieceofclot...