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I can't help you next week, I've got too much on my plate. 我下周不能帮你了,我自己的工作一大堆.
have enough/a lot/too much on your plate: to have a lot of work or problems, etc. to deal with 问题(或工作等)成堆
I'm sorry I can't be of help. I have enough on my plate. 对不起,我不能提供帮助.我自顾不暇.