falling-off biofilm脱落的生物膜
falling -off效率减低
falling-off accident脱落事故
falling-off phenomenon[物化] 降变现象;翻译
falling-off e下降
falling-off U下降
falling-off in speed转速下降
falling-off prevention device落梁防止装置
N-SING（单数型名词） If there is a falling-off of an activity, there is a decrease in its amount or intensity. (数量)下降; (强度)减退 [N 'of/in' n]
There has been a falling-off in box office income and other earnings.
票房收入和其他进项已经有所下降。