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 blood running through your arteries flows with too much force and puts pressure on your arteries, stretching them past their healthy limit and causing microscopic tears.
高血压是一种被广为误解的医疗症状。 血液流经您的动脉时遇到太多阻力而对你的动脉产生压力，导致超过它们的健康极限而引起微"泪滴"。
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。
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