accretion
n. 积聚层，冲积层；加，积聚（过程）；积淀物，增加物；吸积
复数 accretions
例句
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。
《柯林斯英汉双解大词典》
The implication is that the gases in the mantle came not from the sun but from the early accretion of rocky material.
这意味着地幔中的气体不是来自太阳，而是来自岩石物质的早期积累。
Planets are believed to emerge from the accretion of particles in a disk of gas and dust as they whirl around the star.
行星被认为是由围绕恒星旋转的气体和尘埃组成的圆盘中的粒子累积而成。
