2 sentences

1. 牛奶在热天会很快变酸。

   niú​nǎi zài rè​tiān huì hěn kuài biàn suān.

   Milk sours quickly in hot weather.

   Source: AI Challenger 2017

2. 你喜欢热天还是喜欢冷天，为什么？

   nǐ xǐ​huan rè​tiān hái​shi xǐ​huan lěng​tiān, wèi​shén​me?

   Do you prefer hot or cold weather, and why?

   Source: CCMatrix