请阅读Tim从美国发来的电子邮件，并根据所给提示和要求，以陈红的名义回复。

Dear Chen Hong,

    How are you doing? I have been busy since I came back from China. Guess what? I am learning Chinese very hard, but I find it really difficult to learn Chinese well. Please tell me what you think the best way is.

    One more thing, I hear you have the Mid-Autumn Festival in China. What's the date of the festival? How do you celebrate it?

要求：

⑴邮件必须包括所含提示内容，可适当发挥。

⑵邮件中不得涉及真实的人名，校名和地名。

⑶词数：80左右。

参考词汇：the lunar calendar, the symbol of reunion（团圆的象征）

Dear Tim,

    …

Yours,

Chen Hong