数量的增减 meaning in English

increase of decrease in quantity
increase or decrease in quantity

In addition , used memory and free memory were modified by roughly the same amount
此外，已用内存和空闲内存大致地呈现相同数量的增减。
This paper focuses on the prefectures of suzhou , songjiang and taicang ( all of which belonged to jiangnan ' s sunan region ) , and is based on a statistical analysis of the distribution and expansion of market towns in order to determine this area ' s socio - economic conditions during the mid - ming dynasty
为?解明中叶（ 1550年为止）江南地区的情况，本文选择以其核心所在的苏州府、松江府、太仓州，也就是太湖以东的苏南地区为研究范围，以市镇数量的增减、分布及个别镇的规模作为分析的对象，籍以蠡测当地社会经济发展的概况。