Update opensource and teaching

Author: huaicheng

content/opensource/_index.md

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-Our research group develops and maintains several open-source software projects that contribute to the computer systems research community. All projects are hosted on our [GitHub organization](https://github.com/moatlab).
+Our research group develops and maintains several open-source software projects. All projects are hosted on our [GitHub organization](https://github.com/moatlab).
 
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content/teaching/_index.md

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-I believe in hands-on, research-oriented teaching that connects theoretical concepts with real-world applications. My teaching approach emphasizes practical experience, research integration, collaborative learning, and industry relevance.
+We believe in hands-on, research-oriented teaching that connects theoretical concepts with real-world applications. Our teaching approach emphasizes practical experience, research integration, collaborative learning, and industry relevance.
 
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