accumulate
/əˈkju:mjuleɪt; ə`kjumjəˌlet/ v
1 [Tn] gradually get or gather together an increasing number or quantity of (sth); get (sth) in this way 积累, 聚积（某物）; 聚集而成（某事物）
accumulate books, a library 收藏书籍, 集成书库
accumulate enough evidence to ensure his conviction 搜集足够的证据以给他定罪
By investing wisely she accumulated a fortune. 她由於投资精明而积蓄了一笔财产.
My savings are accumulating interest. 我的储蓄不断生息.
2 [I] increase in number or quantity 增加
Dust and dirt soon accumulate if a house is not cleaned regularly. 房屋不经常打扫, 尘土很快就越积越多.