There has been a decrease in traffic accidents.

交通事故减少了。

《新英汉大辞典》

A decrease in face-to-face social contact can precipitate depression.

面对面社交接触的减少会导致抑郁。

youdao

Many scholars claim that spending time on electronic devices doesn't necessarily mean a decrease of time for other activities.

许多学者声称，花时间在电子设备上并不一定意味着减少其他活动的时间。

youdao

In China,some farmers and researchers blame a decrease in pesticide use for an increase in pests unaffected by Bt.

VOA: special.2009.10.27

The return, of course, in any given time period is the percentage increase in the portfolio; or, it could be a negative number, it could be a decrease.

当然了，收益率是一定时间内,投资组合的增长率;,也可能是一个负数，表示负增长。

耶鲁公开课 - 金融市场课程节选

So would you expect, therefore, as we go across a row for the atomic radius, to increase or to decrease? Good. OK, yes.

那么大家觉得，原子半径沿着某一行向右走，是会增大还是会减小呢？很好，不错，是的。

麻省理工公开课 - 化学原理课程节选

Only 22% of them anticipate a decrease in hiring, down from 86% a year ago.

FORBES: The State of the CEO: Things Are Looking Up

Cambridgeshire saw a decrease from 671 to 634 in the number of allegations in those complaints.

BBC: Cambridgeshire Police complaints increase by 3%

There was also a decrease in cytokine proteins related to inflammation and allergic reactions.

WSJ: Don't Call It Pampering: Massage Wants to Be Medicine