| 词汇 | sediment |
| 词根词缀 | 词源： 1547, from Fr. sédiment (16c.), from L. sedimentum "a settling, sinking down," from stem of sedere "to settle, sit" (see sedentary). As a type of rock, sedimentary is first recorded 1830 (in Lyell); sedimentation is from 1874. |
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