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自从我上次见到他以来,已经有三个月之久了。
It has been three months since I saw him last.
youdao
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在此刻,这一新的发明却,已经有三个月的历史了。
This thing this new invention is three months old at this point.
youdao
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在此刻,这一新的发明却,已经有三个月的历史了。
This thing this new invention is three months old at this point.
youdao