Tears contain oil, in this YouTube video, the doctor is pointing out the oil glands that are in the eyelid.

眼泪中含有油脂。在这个YouTube视频中，医生所指的部位是眼睑中的油腺。

In severe cystic acne cases, stronger retinoids actually work at the deeper layers of skin to reduce the size of the oil glands so they produce less sebum.

囊性痤疮严重时，药效更强劲的类维生素A实际上作用于皮肤的更深层，它可以缩减皮脂腺的尺寸，从而减少皮脂的分泌。