累积层

Soil organic layer in forest can be defined as a layer of accumulated organic materials including freshly, fragmented and humified litters on the soil surface, which play a key role in the global carbon cycle.

森林土壤有机层是指累积在土壤表面未分解到完全分解的有机残余物质，在全球碳循环中具有十分重要的作用和地位。

Compared to other elements content in different parts of different genotypes of wheat grains, we can find that there was extremely remarkable linear relations between the content of Pb and Cd

植物受重金属的污染往往是多种重金属的复合污染[15]，通过比较不同基因型水稻籽粒同一部位和不同部位Cd含量的差异，发现对Pb、Cd积累的部位差异是一致的，均是糊粉层累积最多，内胚乳最少。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。