Color blindness, a kind of inheritance diseases, has been always believed as an untreated disease, because the mechanism of color vision has been unknown.
色盲是一种遗传性疾病，由于色觉机理尚未研究清楚，一向不能矫治。
Cholera is an acute diarrhoeal disease that can kill within hours if left untreated.
霍乱是一种急性腹泻性疾病，如未经治疗，可在数小时内致命。
Dysentery is an infectious disease. If left untreated, dysentery can be fatal.
痢疾是一种传染病。如果不治疗，痢疾可能致命。
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