a moment before
之前一刻 before the moment
眼前一刻 The Time Being
youdao
事故前一刻发生的事他都记不得了。
What happened just before the accident was expunged from his memory.
《牛津词典》
我只比较，它们碰撞前一刻，与碰撞后一刻。
I only compare just the moment before they hit with just the moment after they hit.
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