总体来讲，处理（或清除）二氧化碳的自然过程是相当缓慢的，这意味着大气中增加的二氧化碳含量如果靠自然过程处理，会持续很久。
THE natural processes which dispose of carbon dioxide are, in aggregate, rather slow, which means that an increase in the atmosphere's carbon-dioxide level will, left to itself, last a long time.
它既是一个把土地的自然生态系统变为人工生态系统的过程，也是一个自然、经济、社会诸因素综合作用的复杂过程。
It is a land of natural ecosystems into artificial ecosystem process, is also a natural, economic, and social factors at the complex process.
自然垄断现象也是市场过程演化过程中的自然现象，无论源于规模经济还是范围经济，都表明自然垄断具有动态效率特征。
Similarly, natural monopoly is a natural phenomenon of market process evolution. Whether as a consequence of scale economy or scope economy, natural monopoly represents dynamic efficiency.
生产过程既是人类利用自然资源和自然力的过程，也是社会过程。
The productive process is not only the process human beings make use of natural resources and forces, but also a social process.
并通过吸收传质流体CFD模型，应用有限元方法对气液吸收过程中出现的自然对流发生过程进行了数值计算，得到了液相自然对流发生时的非稳态流场分布和浓度分布信息。
Unsteady flow and concentration fields in the liquid phase of a gas-liquid contacting system were simulated to show the natural convection by utilizing the finite-element CFD method.
并通过吸收传质流体CFD模型，应用有限元方法对气液吸收过程中出现的自然对流发生过程进行了数值计算，得到了液相自然对流发生时的非稳态流场分布和浓度分布信息。
Unsteady flow and concentration fields in the liquid phase of a gas-liquid contacting system were simulated to show the natural convection by utilizing the finite-element CFD method.
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