The pillow uses a kind of LED material below the surface.

该枕头的表面下使用了一种 LED 材料。

youdao

He dived below the surface of the water.

他潜入了水中。

《牛津词典》

A crocodile was lurking just below the surface.

有条鳄鱼就潜伏在水面下。

《牛津词典》

Carlsbad Caverns National Park contains more than one hundred caves below the surface of the desert.

VOA: special.2009.12.07

This tactile mastery attests to something remarkable that's happened over the course of the poem, somewhere below the surface of the poem, somewhere between the lines.

这种触觉的掌控证明了一些发生在诗歌里的意义非凡的事情,这些事情贯穿诗歌的整体，暗藏在诗歌的表面之下，深埋在字里行间。

耶鲁公开课 - 弥尔顿课程节选

But live roots or weeds might remain below the surface.

VOA: special.2009.07.07

After all, seeing cool fish and colourful coral is the main reason divers descend below the surface.

BBC: Underwater volunteer vacations

Their world below the surface was as alive and brimming with detail as their world above it.

BBC: The end of a wandering way of life?

They wanted to know, before they made their first incision, what was just below the surface.

NEWYORKER: In the Air