粘液素

例句：

1. 1. Mucus is a sticky substancethat coats the inside of our noses and throats.
   黏液是一种黏稠的物质，覆盖在我们鼻子和喉咙的内部。
2. 2. The doctor advised him to drink plentyof water to help flush out the mucus.
   医生建议他多喝水来帮助排出黏液。
3. 3. Mucus plays an important rolein maintaining the balance of the body's immune system.
   黏液在维护身体免疫系统平衡中起着重要作用。