3 sentences

1. 面对危险，他一步也没有后退。

   miàn​duì wēi​xiǎn, tā yī bù yě méi​yǒu hòu​tuì.

   Facing danger, he didn't take a single step back.

   Source: Dong Chinese Dictionary

2. 她后退了一步。

   tā hòu​tuì le yī bù.

   She took a step back.

   Source: OpenSubtitles

3. 象棋里的卒只能向前走，不能后退。

   xiàng​qí lǐ de zú zhǐ néng xiàng​qián zǒu, bù néng hòu​tuì.

   A pawn in Chinese chess can only move forward and cannot retreat.

   Source: Dong Chinese Dictionary