3 sentences

1. 要警惕腐朽思想使人变质。

   yào jǐng​tì fǔ​xiǔ sī​xiǎng shǐ rén biàn​zhì.

   We must be wary of decadent ideas causing moral degradation.

   Source: Dong Chinese Dictionary

2. 这种腐朽的生活方式应当被摒弃。

   zhè zhǒng fǔ​xiǔ de shēng​huó fāng​shì yīng​dāng bèi bìng​qì.

   This decadent lifestyle should be abandoned.

   Source: Dong Chinese Dictionary

3. 由于长年受潮，这根木桩已经完全腐朽了。

   yóu​yú cháng​nián shòu​cháo, zhè gēn mù​zhuāng yǐ​jīng wán​quán fǔ​xiǔ le.

   Due to years of dampness, this wooden post has completely rotted away.

   Source: Dong Chinese Dictionary