之内 之內

我们必须在五分钟之内离开。

Wǒ men bì xū zài wǔ fēn zhōng zhī nèi lí kāi.

We have to leave in five minutes.

在一天之内完成它几乎是不可能的。

Zài yī tiān zhī nèi wán chéng tā jī hū shì bù kě néng de.

It's next to impossible to finish it in a day.

我下定决心要在三年之内达成目标。

Wǒ xià dìng jué xīn yào zài sān nián zhī nèi dá chéng mù biāo.

I have made up my mind to achieve my goals in three years.