falling off 降落 ; 减少
falling off of drill string 跑钻
falling-off phenomenon [物化] 降变现象
falling-off in speed 转速下降
Never Falling Off 永不剥落
N-SING 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。
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