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。

《牛津词典》

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

表层皮肤必须移植到烧伤处。

《柯林斯英汉双解大词典》

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

顶部图层应当指向下面的图层。

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The top layer contains hundreds of control channels through which pressurized water is pumped.

FORBES: Science Beyond Belief

Some particles, however, are energetic enough to puncture the top layer and strike the second layer.

ECONOMIST: Orbital debris

This melt water has a relatively low density, so it accumulates in the top layer of the ocean.

BBC: Melt may explain Antarctica's sea ice expansion