既然事情已经发生
Since the incident has already occurred
以上为机器翻译结果，长、整句建议使用 人工翻译 。
既然事情已经发生了，就没有后悔的余地了。
Now those things have happened, there is no room for regret.
youdao
既然事情已经发生，我不可能当作没有发生过。
Since the things have taken place, it is impossible as there were never happen.
I can't treat it as if it never happened.
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