狂欢节上的面具色彩鲜艳。

The ___masks at the carnival are brightly colored.

医生和护士在医院工作时必须戴防护口罩。

Doctors and nurses must wear protective ___masks while working in the hospital.

她总是戴着快乐的面具，隐藏内心的悲伤。

She always wears a ___mask of happiness to hide her inner sadness.

做完清洁后，她在脸上敷了一张保湿面膜。

After cleansing, she put on a moisturizing ___mask for her face.