唾液是唾液腺的分泌物。 Saliva is secretion of the salivary glands.
经过若干演化阶段，蛇的唾液，一种温和的助消化的象人们的唾液一样的液体变成了甚至在今天也难以分析的毒液。 Over the periods their saliva, a mild, digestive juice like our own, was converted into a poison that defies analysis even today.
唾液能帮助咀嚼和消化食物。 Saliva helps one chew and digest food.
