1. 增加物;添加物
An accretion is an addition to something, usually one that has been added over a period of time.

2. 添加；累积
Accretion is the process of new layers or parts being added to something so that it increases in size.

1. (law) an increase in a beneficiary's share in an estate (as when a co-beneficiary dies or fails to meet some condition or rejects the inheritance)

2. an increase by natural growth or addition

Synonym: accumulation

3. (geology) an increase in land resulting from alluvial deposits or waterborne sediment

4. (biology) growth by addition as by the adhesion of parts or particles

5. (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases

6. something contributing to growth or increase

e.g. he scraped away the accretions of paint
the central city surrounded by recent accretions