Based on the use of a reasonable space of each presentation.

在使用的基础上合理的演示每一个空间。

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Know your audience and prepare your presentation based on that knowledge.

了解你的听众，在此基础上准备你的演讲。

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Know your audience and prepare your presentation based on that knowledge.

了解你的听众，在此基础上准备你的演讲。

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