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
- 上一篇：Blinking helps （）the surface of the eye with tears, washing away dust and other irritants and keeping the sight clear.
- 下一篇：In addition to generating income, women also take responsibilities for household activities such as childcare, cleaning and preparing food, which are not as lightweight and easy as generally（）.（think）