a (style of) talk to a group of people in which 20 slides (= individual pages of information on a computer screen) are shown for exactly 20 seconds each

The video describes what a PechaKucha is, how to make one, and how to deliver it. 这个视频介绍什么是”20x20限时简报“，如何制作以及如何演讲。

The presentation style of PechaKucha keeps presenters on track and on their toes. ”20x20限时简报“的演讲风格让报告人在发言过程中始终保持清醒头脑。