The outer lipid layer is an oily film that seals the tear film on the eye and helps to prevent evaporation.

外面的脂质层是一层油性膜，它将泪液膜封在眼球上，帮助阻止蒸发。

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The outer lipid layer is an oily film that seals the tear film on the eye and helps to prevent evaporation.

外面的脂质层是一层油性膜，它将泪液膜封在眼球上，帮助阻止蒸发。

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