Plane blade cutting, manual cutting feed, and with smooth end surface.
平刀裁切，手动进刀，端面平整。
Rock fragments from the subsoil can end up concentrated on the surface.
来自底土的岩石碎片最终可能集中在地表。
Because a surface is a two-dimensional object, that will end up being a double integral.
由于表面是二维的，所以结果是二重积分。
You can move across and end your movement on any vertical or liquid surface.
你可以穿越并且停留在垂直或液体表面。
The uppermost part, point, surface, or end.
处在顶点或者最高点。
The uppermost part, point, surface, or end.
处在顶点或者最高点。
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