The injury affects both the upper and lower layers of skin.

皮肤上下皮层都被损伤。

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Via the beam frame structure, the upper and lower layers of a combination house can be simply and stably combined.

通过梁架结构 可以实现组合式房屋上下两层的简便、稳定的结合。

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When the battery is being charged, magnesium antimonide in the middle layer breaks down into the pure elements and so the upper and lower layers deepen.

当电池正在充电，在中间层的组合物分解成纯元素，所以上下层变得更厚了。

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If I looked within the skin, one of the lower layers of your skin, the connective tissue layer, you'd find many fibroblasts there and they're just waiting in a more rounded shape than this, just waiting to do their job.

如果观察皮肤,更深处的一层细胞,结缔组织层,就能看到许多成纤维细胞,它们平时形状接近圆形,时刻准备着去完成自己的任务

耶鲁公开课 - 生物医学工程探索课程节选

Pipes have now been put in place in Lake Nyos and nearby Lake Monoun to siphon water from the lower layers up to the surface and allow the CO2 at the bottom of the lake to slowly bubble out, preventing a repeat of 1986 tragedy.

BBC: 1986: Hundreds gassed in Cameroon lake disaster

Observations from orbit have identified clay and sulfate minerals in the lower layers, indicating a wet history.

ENGADGET: NASA's Curiosity rover receives long-distance OTA update, 'brain transplant' on Mars

Though Texas increasingly looked like a broad, bragging California, full of high-tech clusters and with the white Anglo culture besieged by Latinos and Asians, Mrs Richards was well aware of the unchanging lower layers.

ECONOMIST: Ann Richards