在他担任总统期间，失业率下降了。

Zài tā dānrèn zǒngtǒng qījiān, shīyèlǜ xiàjiàng le.

During his presidency, the unemployment rate fell.

我们在旅行期间遇到了一些挑战。

Wǒmen zài lǚxíng qījiān yùdàole yīxiē tiǎozhàn.

We encountered some challenges during our trip.

这个会议将在下午的期间进行。

Zhège huìyì jiāng zài xiàwǔ de qījiān jìnxíng.

The meeting will take place during the afternoon.