decidua menstrualis

例句：

1. 1. During the menstrual period, she often wears a menstrual veil to protect her skin from friction.
   在月经期间，她经常佩戴月经膜来保护皮肤免受摩擦。
2. 2. The doctor advised her to keep her menstrual veil clean and dry to prevent infection.
   医生建议她保持月经膜清洁干燥，以防止感染。
3. 3. She was surprised when she discovered that her menstrual veil had becomestained with blood.
   当她发现她的月经膜被血染红时，她感到惊讶。