Meibomian glands secrete meibum, an oily substance that prevents evaporation of the eye's tear film.
睑板腺分泌油脂，这是一种防止泪膜蒸发的油性物质。
Tear film
原声例句
日常生活医学科普
VOA Daily Standard 2018年8月合集
The tear film on the front of your eyes is there all the time, not just when you cry.
眼表的泪液膜一直都在，不哭的时候也在。
VOA常速英语_健康
" The tear film on the front of your eyes is there all the time, not just when you cry. It’s less than a tenth of the thickness of a human hair, but without it, you wouldn’t see at all" .
角膜前面的泪膜不只是当你流泪的时候才存在。其厚度仅相当于人类头发丝的十分之一，但没有它，你根本就看不到东西。"
英语百科
Tears
Tearing (/ˈtiərɪŋ/), lacrimation, or lachrymation, (fromLatin lacrima, meaning "tear") is the secretion of tears, which often serves to clean and lubricate the eyes in response to an irritation of the eyes. Tears formed through crying are associated with strong internal emotions, such as sorrow, elation, emotion, love, awe or pleasure. Laughing or yawning may also lead to the production of tears.
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