Written confirmation came three days later.

三天后获得了书面确认.

《简明英汉词典》

You should receive written confirmation of the loan in a few days.

几天后,你就会收到贷款的书面答复.

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I want your written confirmation stating that after remittance you will asked any price difference.

兹请撰文确认,一旦汇款,你方不得再有异价.

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