4 sentences

1. 你很擅长划清界线啊。

   nǐ hěn shàn​cháng huà​qīng jiè​xiàn a.

   You're good at drawing boundaries.

   Source: OpenSubtitles

2. 我们得划清界限。

   wǒ​men děi huà​qīng jiè​xiàn.

   We need to make clear boundaries.

   Source: OpenSubtitles

3. 我们要同这些错误思想划清界限。

   wǒ​men yào tóng zhè​xiē cuò​wù sī​xiǎng huà​qīng jiè​xiàn.

   We must draw a clear line between ourselves and these erroneous ideas.

   Source: Dong Chinese Dictionary

4. 在重大原则问题上，我们必须划清阵线。

   zài zhòng​dà yuán​zé wèn​tí shàng, wǒ​men bì​xū huà​qīng zhèn​xiàn.

   On major issues of principle, we must draw clear battle lines.

   Source: Dong Chinese Dictionary