3 sentences

1. 他摔坏了杯子来泄气。

   tā shuāi​huài le bēi​zi lái xiè​qì.

   He smashed the cup to vent his anger.

   Source: Dong Chinese Dictionary

2. 这辆自行车的后胎泄气了。

   zhè liàng zì​xíng​chē de hòu tāi xiè​qì le.

   The rear tire of this bicycle is flat.

   Source: Dong Chinese Dictionary

3. 一次失败没关系，千万别泄气。

   yī cì shī​bài méi guān​xì, qiān​wàn bié xiè​qì.

   One failure doesn't matter; don't lose heart.

   Source: Dong Chinese Dictionary