他们有三个区域需要工作。

They have three areas to work on.

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从图3中，可以看出此页面有三个区域。

In Figure 3, you see that there are three areas of the page.

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湖面浮标分为三个区域。

The lake was divided into three areas by the buoys.

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So the repeating unit in DNA is this structure here, a nucleotide, which has three different regions.

NA的重复单位就是,核苷酸,它有三个不同的区域

耶鲁公开课 - 生物医学工程探索课程节选