It is because in the onion are compounds of sulfur or sulfur is. When we slice the onions. Make it explode into the air, and when the enzymes in onions help to accelerate the reaction helped come into us, and when it enters our eye, it will cause a reaction with water to moisten in the eyes become acid, sulphur, Fu-resulting in irritation and burns in the eyes. The body must produce tears comes out to wash and reduce skin irritation.
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