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最近几年，科学家经研究发现，创伤经历的影响会随着DNA的改变而遗传给后代（trauma can be passed down due to changes in DNA）。这种研究基于非基因序列改变所致基因表达水平变化的学科叫做表观遗传学（epigenetics）。实验中，与母鼠分离的幼鼠不仅自身因承受巨大的心理创伤（experience traumatic stress）而呈现出创伤后遗症状，而且它们的后代虽然并未与母鼠分离，但仍无一例外地出现了同样的创伤后遗症状。简单地说，痛苦和不幸是会通过基因表达的变化代代相传。然而研究还发现了故事的另一面，遗传了创伤影响的小鼠在长期经历积极的体验（exposed to positive experiences）之后，它们的行为以及它们后代的命运（fate of their offspring）都得到了改变。沮丧带来的行为失控、认知障碍、反社会行为（antisocial behaviors）、风险倾向（risk-taking）以及生物学根源（即表观基因组）都可以因接触积极的环境而得到扭转。

今天的句子:

词汇突破：

1.Traumatize 创伤

2.Symptom症状

3.Psychiatric 心理的

4.Metabolic 代谢

5.Reverse 扭转

6.Engrave 铭刻

7.Epigenome 表观基因组

8.Dynamic 动态

9.Correction 纠正

第一句:

There is hope that even for people who have been traumatized during childhood and have severe symptoms, psychiatric symptoms or other metabolic symptoms or other problems with the body, these can be reversed at some point. 

主干识别：

There is hope that…

切分成分：

1. these can be reversed at some point.

同位语从句主干

2. for people who have been traumatized during childhood and have severe symptoms, psychiatric symptoms or other metabolic symptoms or other problems with the body

参考译文:甚至对于在儿童时期受到创伤且症状（心理、代谢或其它身体症状）严重的人们而言，他们的问题都有希望在某个时间点得以扭转。

第二句：

So even if this is engraved in the epigenome, the biology is dynamic enough to allow correction.

确定主干：

the biology is dynamic enough to allow correction.

切分成分

even if this is engraved in the epigenome

参考译文：所以即便（创伤）深深铭刻在表观基因组中，生物学也足够能动，允许修正。

明天的句子：

But universalism is expensive and should be reserved for when it is clear that providing two-tier, means-tested services would erode quality and levels of provision and create harmful social stigma.

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