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in three days' time; two days after tomorrow
明々後日までにレポートを提出してください。
Please submit the report by three days from now.
明々後日は祝日なので会社は休みだ。
Three days from now is a holiday, so the office is closed.
明々後日の天気は晴れの予報が出ている。
The forecast for three days from now calls for clear skies.