涎液过少

例句：

1. 1. The doctor advised him to drink more saliva to help his throat.
   医生建议他多喝水来帮助他的喉咙。
2. 2. Saliva is a natural substance that helps keep our mouth moist.
   唾液是一种自然的物质，可以帮助保持我们的口腔湿润。
3. 3. Saliva contains enzymes that break down food and aid in digestion.
   唾液含有酶，可以分解食物并帮助消化。