The theory of cognitive load views the limitations of working memory capacity as a major barrier to learning.

认知负荷理论把工作记忆容量的有限性看作是影响学习的主要障碍。

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Having a large reducing capacity, the lamprophyre is the best geochemical barrier for thedeposition and concentration of gold.

指出煌斑岩具有较强的还原性能，是金沉淀富集的良好地球化学屏障。

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In some instances the barrier to access is not distance, but capacity.

FORBES: A New Kind of Distance Learning

The project consists of three mines holding 7.92 billion tons of coal resources, a planned 300 mile railway capable of carrying 60 million tons annually, and a port built to the same capacity at Abbot Point on Australia's Great Barrier Reef coast.

WSJ: GVK: Bidders Line up for Giant Australian Coal Mine