头发是死的，一旦其毛囊主轴受到挤压，其生物物质由于心理创伤或恐惧不能着色或漂白。
Hair is dead, and once the main shaft of the hair follicle is extruded, expired biomass can't be tinted or bleached by psychological trauma or fear.
我们预计到，可能会有虐待史或者被忽略的创伤，一个支离破碎而风雨飘摇的家庭，或者某种物质滥用。
We anticipate that there might be a history of abuse or neglect, severe trauma, a fragmented and unstable family, or a pattern of substance abuse.
研究人员称进一步的研究应关注患有如创伤后紧张症的精神疾病病人使用该大脑化学物质的效果。
Researchers say future studies could look at the effects of the brain chemical in patients with other psychiatric disorders, such as post-traumatic stress disorder.
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