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You notice your tears most after a good cry or while slicing an onion, but actually your eyes are constantly moistened by a thin film of tears.
切洋蔥或者痛哭之后你會注意到自己流淚了，但事實上，淚薄膜使你的眼睛常常保持濕潤這種狀態。
This film has three distinct layers: an outer, oily layer to prevent evaporation; a middle layer of lacrimal fluid, the main ingredient of tears; and an inner, mucous layer. This three layer film is replenished every time you blink, and it provides essential protection for your eyes.
淚薄膜由三個不同的層面組成：外層是防止蒸發的油脂層，中層是眼淚的主要成分——淚腺液體，內層是粘膜層。每當你眨一次眼睛，這三層薄膜就得到補充，這為你的眼睛提供必要的保護。
Most of your body is protected by skin of course, and your outer layer of skin is made of dead cells and keratin, an opaque, protective substance. Your eyes need to be transparent,however; they can't be covered by a layer of dead cells and keratin. One of the main functions of tears therefore, is to keep these cells alive.
當然你身體的大部分是由皮膚來保護，皮膚外層是由死細胞和角蛋白（即一種不透明的防護物質）組成。然而，眼睛卻需要透明的保護層；在眼睛表面不能覆蓋有死細胞或者角蛋白。因此眼淚的一個主要的功能就使這些細胞保持活力。
Tears are loaded with electrolyte salts, chemicals that are also found deep inside your body. These salts make your outer eye cells feel like they're inside your body, preventing them from turning into cells similar to skin cells.
眼淚含有電解的鹽類物質，這類化學物質在你身體的深處也存在。這些鹽類物質將外眼細胞與外界隔離，防止它們變得類似于表皮細胞。
Tears help your eyes in other ways too. When a speck of dust gets in your eye, it's coated with mucous from glands in the white of your eye, then washed out with extra fluid from the lacrimal glands, the main tear producing glands above the eye.
眼淚也能從其他方面保護眼睛。當一粒灰塵進入眼睛時，眼白部分的腺體就會分泌粘液將它包裹起來，然后隨多余的液體從淚腺中流出。淚腺是產生眼淚的主要腺體。
To protect your eyes from germs, tears also contain bacteria fighting enzymes. What's more, tears provide a good optical surface. They smooth out the microscopically uneven cells of your cornea. Without tears, tiny irregularities in your eye would give you constantly fuzzy vision.
為了保護眼睛不受細菌侵襲，眼淚中也含有抗細菌酶。更重要的是，眼淚能夠幫助撫平微小不均勻的細胞角膜，從而形成一個良好的視覺表面。沒有眼淚，那些微小不規則的角膜就會使視線變得模糊。
Although they're most apparent during a good cry, tears are actually an essential part of everyday life.
盡管只有在哭泣的時候才見眼淚，但它的確是日常生活中不可缺少的一部分。
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