然而现在，我们就要庆祝我们的结婚4周年纪念日了，而且还沉浸在我们儿子两周岁生日派对的喜悦之中。

But here we are, coming up to our fourth wedding anniversary and still recovering from our son's second birthday party.

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这段话是说：妈妈和爸爸完全不知道我们为他们50周年结婚纪念日准备了一场派对。

Mom and dad have no idea that we're organizing a party to celebrate their 50th wedding anniversary.

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