We have a vacation for three months!

我们有三个月的假期！

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Three months have passed before we knew it.

不知不觉已过了三个月。

《新英汉大辞典》

During these three months, we have to trust each other.

我们需要在这，三个月中彼此信任。

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We have been in Shanghai for three months.

我们在上海待了三个月了。

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We have been in Shanghai for three months.

我们在上海待了三个月了。

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