a.  积累的，渐增的

• the cumulative effect of  日积月累的影响

• the cumulative total  累计总数

• Improve his cumulative grade. 累计分数

• The cumulative effect of these two factors is that many Americans are forced to take two or more part-time jobs, just to make ends meet. 累积效应/日积月累的影响

• Learning is a cumulative process. 学习是个逐渐积累的过程。

• Depression is often caused by the cumulative effects of stress and overwork. 抑郁症通常是由压力和过度劳累日积月累引起的。

BrE /əˌbriːviˈeɪʃn/   

NAmE /əˌbriːviˈeɪʃn/