2 sentences for 人后 (rén​hòu)

1. 他是个典型的两面派，在人前一套，人后一套。

   tā shì gè diǎn​xíng de liǎng​miàn​pài, zài rén​qián yī tào, rén​hòu yī tào.

   He is a typical double-dealer, saying one thing to people's faces and another behind their backs.

   Source: Dong Chinese Dictionary

2. 在这个科技时代，谁不创新谁就会落于人后。

   zài zhè gè kē​jì shí​dài, shéi bù chuàng​xīn shéi jiù huì luò yú rén​hòu.

   In this technological age, those who do not innovate will fall behind.

   Source: Dong Chinese Dictionary