唾液是唾液腺的分泌物。 Saliva is secretion of the salivary glands.
經(jīng)過若干演化階段，蛇的唾液，一種溫和的助消化的象人們的唾液一樣的液體變成了甚至在今天也難以分析的毒液。 Over the periods their saliva, a mild, digestive juice like our own, was converted into a poison that defies analysis even today.
唾液能幫助咀嚼和消化食物。 Saliva helps one chew and digest food.
