mucous coat

例句：

1. 1.The doctor advised the patient to avoid touching the wound with his fingers.
   医生建议病人避免用手指触摸伤口。
2. 2. The scientist discovered a new species of bacteria in the mucous coat of the human mouth.
   科学家在人类的口腔黏膜中发现了一种新细菌。
3. 3. The patient's mucous coat was severely damaged by the infection.
   患者的黏膜层因感染而严重受损。