[C, U] ~ (in sth)an act of making sth less or smaller; the state of being made less or smaller 减少；缩小；降低
a 33% reduction in the number of hospital beds available
医院的床位减少 33%
There has been some reduction in unemployment.
失业人数有所减少。
a slight/significant/substantial/drastic reduction in costs
成本的略微／显著／大幅度／急剧降低