As far as the degradation and the use of the lignocellulose are concerned, the middle and lower layers of the compost are almost the same as the upper layer of the compost.
就菌袋中不同料层木质纤维素的降解和利用而言，菌袋的中层和下层与上层相似。
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。
These 2 crusts show 3 structural layers: compact upper layer, porous middle layer and compact lower layer.
这2个结壳从结构上分为3层：致密型上层、疏松型中层和致密型下层。
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