3 sentences

1. 信息不对称是导致市场失灵的一个重要原因。

   xìn​xī bù​duì​chèn shì dǎo​zhì shì​chǎng shī​líng de yī gè zhòng​yào yuán​yīn.

   Information asymmetry is a major cause of market failure.

   Source: Dong Chinese Dictionary

2. 由于市场环境的变化，旧的经济政策已经完全失灵。

   yóu​yú shì​chǎng huán​jìng de biàn​huà, jiù de jīng​jì zhèng​cè yǐ​jīng wán​quán shī​líng.

   Due to changes in the market environment, the old economic policies have become completely ineffective.

   Source: Dong Chinese Dictionary

3. 飞机的自动驾驶系统在飞行途中突然失灵了。

   fēi​jī de zì​dòng jià​shǐ xì​tǒng zài fēi​xíng tú​zhōng tū​rán shī​líng le.

   The plane's autopilot system suddenly malfunctioned during the flight.

   Source: Dong Chinese Dictionary