In these comparisons of usage techniques for the different document representations I'll show how to accomplish three types of basic operations in each model.

在对不同文档表示中用法技术的这些对比中，我将显示如何在每种模型中实现三种基本操作？

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The majority of the sample was able to perform as high as level four (out of five) of the literacy test, meaning they were able to read, comprehend and answer questions about a simple text, and level three in numeracy, i.e. they were able to perform basic arithmetic operations.

UNESCO: Country Profile: Angola