1. The study did not include an untreated control group. 本研究中不包含未接受处理的对照组。
2. Even minor cuts can become infected if they are left untreated. 如果不处理，即使是很小的割伤口也可能感染。
3. It is important to diagnose early as it can lead to blindness if untreated. 该种病痛一旦出现，需及早诊断，否则可能导致双目失明。
英英解释
adj.
1. not given medical care or treatment
2. not subjected to chemical or physical treatment
3. (of a specimen for study under a microscope) not treated with a reagent or dye
