Dear Marie,
Thanks for inviting me to join your birthday party. But I am feeling so sorry to you that I can't join it.
I would appreciate it if you could forgive my decision.
Yours John
亲爱的Marie,
谢谢你邀请我参加你的生日派对。但是我感到非常抱歉,我无法参加了。
如果你能够原谅我的决定,我一定会很感激的。
John。
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