sed·i·men·ta·tion /ˌsɛdəmənˈteʃən, ˌmɛn-/
沈澱,沈降
Sed·i·men·ta·tion n. The act of depositing a sediment; specifically Geol., the deposition of the material of which sedimentary rocks are formed.
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sedimentation
n : the phenomenon of sediment or gravel accumulating [syn: deposit,
alluviation]