3 sentences

1. 这种药水能防止木材腐烂，起到防腐作用。

   zhè zhǒng yào​shuǐ néng fáng​zhǐ mù​cái fǔ​làn, qǐ​dào fáng​fǔ zuò​yòng.

   This liquid can prevent wood from rotting and serves as a preservative.

   Source: Dong Chinese Dictionary

2. 这些木材需要沉浸在特制的液体中以防腐。

   zhè​xiē mù​cái xū​yào chén​jìn zài tè​zhì de yè​tǐ zhōng yǐ fáng​fǔ.

   The timber needs to be soaked in a special liquid to prevent rot.

   Source: Dong Chinese Dictionary

3. 这里的金属结构都经过了严密的防腐处理。

   zhè​lǐ de jīn​shǔ jié​gòu dōu jīng​guò le yán​mì de fáng​fǔ chǔ​lǐ.

   The metal structures here have all undergone rigorous anti-corrosion treatment.

   Source: Dong Chinese Dictionary