This treatment involves scrubbing off the top layer of dead skin.

这种治疗需要把死皮的表层除去。

The top layer of skin has to be grafted onto the burns.

表层皮肤必须移植到烧伤处。

The top layer should now point down to the layer beneath.

顶部图层应当指向下面的图层。

This treatment is for the top layer.

对顶部图层作处理。

Make a new duplicate from the top layer.

复制顶部图层。