2 sentences

1. 你知道扑克脸是什么吗？

   nǐ zhī​dao pū​kè​liǎn shì shén​me ma?

   Do you know what a poker face is?

   Source: OpenSubtitles

2. 保持一张扑克脸。

   bǎo​chí yī zhāng pū​kè​liǎn.

   Keep a poker face.

   Source: CCMatrix