3 sentences

1. 最简单的解决办法是买一个可重复使用的水瓶和净化药片。

   zuì jiǎn​dān de jiě​jué​bàn​fǎ shì mǎi yī​ge kě chóng​fù shǐ​yòng de shuǐ​píng hé jìng​huà yào​piàn.

   The simplest solution is to buy a reusable water bottle and purification tablets.

   Source: CCMatrix

2. 你听说过空气净化器吗？

   nǐ tīng​shuō guo kōng​qì​jìng​huà​qì ma?

   Have you heard of air purifiers?

   Source: CCMatrix

3. 我什么时候应该使用空气净化器？

   wǒ shén​me​shí​hou yīng​gāi shǐ​yòng kōng​qì​jìng​huà​qì?

   When should I use an air purifier?

   Source: CCMatrix