回答
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Today is my one thousandth lesson with you. Time goes by so quickly.
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We've had one thousand lessons together. I can't believe how fast time flies.
ーToday is my one thousandth lesson with you. Time goes by so quickly.
「今日はあなたとの1000回目のレッスンです。あっという間だ」
one thousandth lesson with you で「あなたとの1000回目のレッスン」
Time goes by so quickly. で「時の経つのが早い・あっという間だ」
ーWe've had one thousand lessons together. I can't believe how fast time flies.
「私たちは一緒に1000回レッスンをしました。時が経つのが早くて信じられない」
to have one thousand lessons で「1000回レッスンを受ける」
time flies で「時間が経つのは早い」
ご参考まで!