accretion /əˈkriːʃən/

• 1. 

  N-COUNT An accretion is an addition to something, usually one that has been added over a period of time. 累加物 [正式]

  例：

  The script has been gathering editorial accretions for years.

  该剧本经历了多年的修改加工。

• 2. 

  N-UNCOUNT Accretion is the process of new layers or parts being added to something so that it increases in size. 累积 [正式]

  例：

  A coral reef is built by the accretion of tiny, identical organisms.

  珊瑚礁是由相同的微生物累积形成的。