不知不觉
(不知不覺)unconsciously
Example Sentences
时间过得真快，不知不觉我们已经认识整整十年了。
shí jiān guò dé zhēn kuài, bù zhī bù jué wǒ men yǐ jīng rèn shí zhěng zhěng shí nián le.
Time flies so fast, and before we know it, we have known each other for ten years.
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