3 sentences

1. 这首歌的词和曲都很有感染力。

   zhè shǒu gē de cí hé qǔ dōu hěn yǒu gǎn​rǎn​lì.

   Both the lyrics and the melody of this song are very infectious.

   Source: Dong Chinese Dictionary

2. 她的歌声富有感染力，深深打动了在场的每一个人。

   tā de gē​shēng fù​yǒu gǎn​rǎn​lì, shēn​shēn dǎ​dòng le zài​chǎng de měi yī gè rén.

   Her singing is very infectious and deeply touched everyone present.

   Source: Dong Chinese Dictionary

3. 这种新型病毒的感染力极强，必须采取严密的防护措施。

   zhè zhǒng xīn​xíng bìng​dú de gǎn​rǎn​lì jí qiáng, bì​xū cǎi​qǔ yán​mì de fáng​hù cuò​shī.

   This new virus is highly infectious, and strict protective measures must be taken.

   Source: Dong Chinese Dictionary