first ten days of the month
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来月上旬に結果が発表される予定だ。
The results are scheduled to be announced in the first third of next month.
桜は四月上旬に咲き始めることが多い。
Cherry blossoms often begin to bloom in early April.
上旬は予定が詰まっていて忙しい。
My schedule is packed in the early part of the month, so I am busy.