如果您正在准备去澳洲留学的英语发言，以下是一些基本的表达和示例，您可以根据自己的情况进行调整：
自我介绍
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Dear Principal Van Ruiten and the whole staff of our sister school,
On behalf of our staff of No.1 Middle School Jiaonan, I would like to express our warmest gratitude for your wonderful hospitality during our stay at your school and city.
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感谢
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We would like to thank you for the opportunity to visit and learn from your esteemed institution. Your support and guidance have been invaluable to us.
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表达期待
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We are excited about the prospect of furthering our education and research in Australia, and we look forward to contributing to the vibrant academic community here.
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结束语
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once again, thank you for having us. We hope to maintain contact and stay connected in the future.
Best regards,
[Your Name]
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请根据具体情况调整发言内容，确保它符合您的个人风格和发言场合的要求。祝您留学顺利!