假如你叫李敏, 你的笔友王艳邀请你去参加聚会。请你用英语给她回信。词数60左右。

要点如下：1.你很抱歉, 不能去。2.你母亲病了, 医生叫她卧床几日, 你要照顾她。3.谢谢她寄来的漂亮的明信片,你很喜欢,将它放在书桌上。

Dear Wang Yan,

Thank you very much for inviting me to your party. _______________________________                

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Give my wishes to your family.

Yours,

Li Min

落压成形过程是（）的产生和消失的过程，也是消除（）和减少（）的过程。