3 sentences

1. 救护车急速驶向事故现场。

   jiù​hù​chē jí​sù shǐ​xiàng shì​gù xiàn​chǎng.

   The ambulance sped towards the scene of the accident.

   Source: Dong Chinese Dictionary

2. 飞机将急速下降。

   fēi​jī jiāng jí​sù xià​jiàng.

   The aircraft will be descending rapidly.

   Source: OpenSubtitles

3. 该地区的经济在过去十年间经历了急速的发展。

   gāi dì​qū de jīng​jì zài guò​qù shí​nián jiān jīng​lì le jí​sù de fā​zhǎn.

   The region's economy has experienced rapid development over the past decade.

   Source: Dong Chinese Dictionary