So the real surface area of the plastics grinding head is much less than the apparent area 由于sic微粒不导电，磨头实际被镀覆的表面积低于宏观表面积。
2.
The international unit for reporting cloud amount . cloud amount is assessed in total which is the estimated total apparent area of the sky covered with cloud 把天空分为八份， 1份即是八份之一的天空被云遮蔽， 2份即是八份之二的天空被云遮蔽，如此类推。
3.
The international unit for reporting cloud amount . cloud amount is assessed in total which is the estimated total apparent area of the sky covered with cloud 把天空分为八份， 1份即是八份之一的天空被云遮蔽， 2份即是八份之二的天空被云遮蔽，如此类推。
