2 sentences

1. 传染病可以通过受污染的水传播。

   chuán​rǎn​bìng kě​yǐ tōng​guò shòu wū​rǎn de shuǐ chuán​bō.

   Infectious diseases can be spread through contaminated water.

   Source: CCMatrix

2. 在疫苗出现之前，很多传染病每年会夺去数百万人的性命。

   zài yì​miáo chū​xiàn zhī​qián, hěn​duō chuán​rǎn​bìng měi​nián huì duó qù shù​bǎi​wàn rén de xìng​mìng.

   Before vaccines existed, many infectious diseases killed millions of people per year.

   Source: CCMatrix