累积成本中累积两个字的重要性在于平均成本是x累积单位的均值。
The significance of the "cum" in cum average is that the average costs are computed for X cumulative units.
年化单位劳动力成本增长率跌落到仅有2%，这是自1950年代以来的最急剧的累积下滑。
Unit labour costs have fallen at an annualised 2% rate, the steepest cumulative decline since the 1950s.
他们工作期间每月薪金只有7.8%作为退休金累积被扣除，之相当于私营单位扣除数额的10.5%。
Yet only 7.8% of their pay is deducted in retirement contributions, next to 10.5% in the private sector.
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