- 沉积: deposit; sedimentation; depo ...
- 的: 4次方是 The fourth power of 2 i ...
- 形成: form; take shape; shape; for ...
- 沉积的: depositional; eluvial; laid down; pent-up; sedimentary; settled; water-laid
- 面积的形心: a.centroid of an area
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