poker face

例句：

1. 1.He gave a poker face when he saw the news.
   他看到新闻时面无表情。
2. 2. She tried to hide her poker face but failed.
   她试图掩饰她的扑克脸，但失败了。
3. 3. The poker face of the actor was so convincing that no one could tell he was acting.
   这位演员的扑克脸太逼真了，以至于没人能看出来他在演戏。