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Tear ducts（泪腺）operate on a normal basis to（）and protect the eye. When you have an emotion, they overact and create tears.（lubrication）

Tear ducts（泪腺）operate on a normal basis to（）and protect the eye. When you have an emotion, they overact and create tears.（lubrication）
正确答案：lubricate

标签：大学英语综合教程泪腺

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