假设你是李华，你的笔友Rob邀请你参加一个国际友好学校的线上论坛，主题为"中国茶"，请根据以下提示用英语写一篇发言稿。
注意：
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What do you know about Chinese tea? | about 5000 years green, black, white |
How was tea invented? | be invented by accident boil… over the open fire fell into… and remained… produce a nice smell |
How is tea produced? | grow on the sides of mountains pick by hand be sent for processing be packed and sent to… |
What's your ideas about Chinese tea? | … |
Ladies and gentlemen,
Today, it's my honor to be here to introduce our national treasure—tea.
That's all, thank you!
