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1. The PDNs are a group of people who work together to solve complex problems.
PDNs是一组合作解决问题的复杂问题的人。
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2. The PDNs have been working on this project for months, and they are close to completing it.
PDNs已经在这个项目中工作了几个月，他们即将完成它。
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3. The PDNs will be hosting a conference next month, and we need to prepare for it.
PDNs将在下个月举办一个会议，我们需要为它做准备。