* 分区函数：将数组按pivot分成两部分
5. Synthesia: AI Avatar-Based Video CreationWhat Makes It Special: Synthesia has transformed video creation by making it possible to create professional-looking AI avatar videos in minutes. Its ability to generate natural-looking presentations in multiple languages with synchronized lip movements and gestures makes it invaluable for creators who need to produce video content at scale without the traditional filming process.
，这一点在heLLoword翻译官方下载中也有详细论述
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paper: “plain smooth surface”
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