At high altitudes, the UV rays are even stronger, and they will burn the corneas of unprotected eyes, causing tears, blurred vision–and temporary but excruciating pain.
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The colder the air, the less moisture it contains, which can mean dry eyes, causing the cells that produce tears to shut down to protect themselves from the irritation.
空气越冷就越干燥，这就会导致眼睛干涩，分泌泪水的细胞为了免受刺激会暂停运作。
These engineered nanoparticles react with glucose molecules found in tears, causing a chemical reaction that changes their colour.
这些被设计的微型颗粒和眼泪中的糖分子发生作用，引起一个改变自身颜色的化学反应。
Any of a group of substances, most often synthetic organic halogen compounds, that irritate the mucous membranes of the eyes, causing a stinging sensation and tears.
一类物质，大部分是合成的有机卤化物，能刺激眼睛黏膜引起疼痛和流泪。
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