fixed mask

例句：

1. 1.The artist used a fixed mask to create the illusion of depth in the painting.
   艺术家使用固定面具在画作中创造出深度的错觉。
2. 2. The detective wore a fixed mask to conceal his identity during the investigation.
   侦探戴着固定面具以掩饰自己的身份进行调查。
3. 3. The actor's performance was so convincing that it felt like he was wearing a fixed mask.
   演员的表现如此逼真，让人感觉他像是戴着一副固定面具。