We would be grateful if you could please sign the original document and return it to us to confirm that you have read and understood our general Terms of Engagement.

我们诚心希望你能够在确实读过并理解承诺条款的大意之后签署原始文件并返还给我们。

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Meaning, that it is the taxpayer who, by the terms of his original return, determines whether he has denied himself the statutorily presumed 3 year bar against IRS assessment of additional tax for that tax year.

FORBES: IRS Lacks Statutory Authority to Extend Time to Assess Tax