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I didn't realize but he was deeply unhappy at that time.
我没有察觉到原来他那时非常不开心。
《牛津词典》
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However, apparently he didn't realize that as deeply as I did at the time.
然而，看上去，这个时候他并没有我领悟得那么深。
youdao
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However, apparently he didn't realize that as deeply as I did at the time.
然而，看上去，这个时候他并没有我领悟得那么深。
youdao