A projection of the top surface can be seen on the left.

顶部的投影在左边能看到。

Top surface of butterfly's wings is covered in iridescent scales.

蝴蝶翅膀的上部表面覆盖着闪光的鳞状物。

A top surface and a bottom surface are defined on the base plate.

该基板上定义一顶表面和一底表面。

A first concave part is formed on the top surface of the base plate.

该基板的该顶表面形成一第一凹陷部。

But if it is on the top surface of COTS Corrugating gap, you need to be adjusted.

若是上胶辊瓦楞顶面间隙大，则须加以调整。