2 sentences

1. 窗外突然刮起一阵大风。

   chuāng wài tū​rán guā qǐ yī​zhèn dà fēng.

   A sudden gust of wind blew outside the window.

   Source: Dong Chinese Dictionary

2. 他忙了一阵，现在终于可以休息了。

   tā máng le yī​zhèn, xiàn​zài zhōng​yú kě​yǐ xiū​xi le.

   He was busy for a while and can finally rest now.

   Source: Dong Chinese Dictionary