decayv.(使)衰退；(使)腐败；(使)腐烂n.衰退；腐烂；腐败decay chart衰变图表decayed tie腐蚀木枕decay phase衰减相位decay ratio衰变率decay event衰变事件decay model衰变方式decay furgi腐朽菌decay track衰变(粒子)径迹decay width衰变宽度decay pulse衰变脉冲