half mask

例句：

1. 1. She wore a half maskto hide her identity.
   她戴着半面具以隐藏自己的身份。
2. 2. The actor wore ahalf mask during the performance.
   演员在表演时戴了半面具。
3. 3. Themask was designed to protectthe performer's face.
   这个面具是为了保护表演者的脸部设计的。