a lubricating function造句

"a lubricating function"是什么意思

造句与例句手机版

The function of the salivary glands is to secrete saliva, which has a lubricating function, which protects the oral mucosa of the mouth during eating and speaking.
It's difficult to see a lubricating function in a sentence. 用a lubricating function造句挺难的

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