3 sentences for 底层 (dǐ​céng — lowest rung)

1. 欢迎来到食物链的最底层。

   huān​yíng lái​dào shí​wù​liàn de zuì dǐ​céng.

   Welcome to the bottom of the food chain.

   Source: OpenSubtitles

2. 他在小说中描写了社会底层的种种不平。

   tā zài xiǎo​shuō zhōng miáo​xiě le shè​huì dǐ​céng de zhǒng​zhǒng bù​píng.

   In his novel, he depicted the various injustices suffered by those at the bottom of society.

   Source: Dong Chinese Dictionary

3. 他的小说主要描写社会底层人物的生活。

   tā de xiǎo​shuō zhǔ​yào miáo​xiě shè​huì dǐ​céng rén​wù de shēng​huó.

   His novels primarily depict the lives of people at the bottom of the social ladder.

   Source: Dong Chinese Dictionary