2 sentences

1. 皮球在硬地上不停地弹跳。

   pí​qiú zài yìng​dì shàng bù​tíng de tán​tiào.

   The ball kept bouncing on the hard ground.

   Source: Dong Chinese Dictionary

2. 运动员在起跳前进行了几次预备弹跳。

   yùn​dòng​yuán zài qǐ​tiào qián jìn​xíng le jǐ cì yù​bèi tán​tiào.

   The athlete did a few preparatory hops before the jump.

   Source: Dong Chinese Dictionary