deposition

n.沉积(物); 沉淀(物); 淤积(物); 罢免; 废黜; 证人陈述 复数：depositions 牛津词典 noun 沉积（物）；沉淀（物）；淤积（物）the natural process of leaving a layer of a substance on rocks or soil; a substance left in this way marine/river...