strengthens the immune system 增强身体的免疫系统机能

　　early exposure to germs 早期接触细菌

　　A new study suggests that early exposure to germs strengthens the immune system.一项新的研究表明，早期接触细菌可以增强身体的免疫系统机能。

　　in a germ-free environment 在无细菌环境中

　　be more likely to develop allergies, asthma and other autoimmune disorders更容易出现过敏、哮喘和其他自身免疫性疾病

　　It found that adult mice raised in a germ-free environment were more likely to develop allergies, asthma and other autoimmune disorders.研究发现，在无细菌环境中长大的成年小鼠更容易出现过敏、哮喘和其他自身免疫性疾病。

　　rheumatoid/'ruːmətɒɪd/ arthritis /ɑːˈθraɪtɪs/ 风湿性关节炎

　　attacks the joints 对关节造成损伤

　　an inflammatory/ɪnˈflæmətri/ bowel/ˈbaʊəl/ condition 炎症性肠道疾病

　　juvenile /ˈdʒuːvənaɪl/ diabetes /ˌdaɪəˈbiːtiːz/ 青少年糖尿病

　　They include rheumatoid arthritis, which attacks the joints; Crohn's disease, an inflammatory bowel condition; and juvenile diabetes.这些疾病包括风湿性关节炎，对关节造成损伤;克罗恩病，炎症性肠道疾病;和青少年糖尿病。

　　an autoimmune /ˌɔːtəʊɪˈmjuːn/ disorder 一种自身免疫性疾病

　　Hay fever, a common allergy, is also an autoimmune disorder.干草热是一种常见的过敏症，也是一种自身免疫性疾病。

　　antibacterial/ˌæntibækˈtɪəriəl/ soaps 抗菌肥皂

　　weaken immune systems 削弱免疫系统

　　They proposed that the increasing use of antibacterial soaps and other products, especially early in life, could weaken immune systems.他们提出，增加使用抗菌肥皂和其他产品，特别是在出生阶段，可能会削弱免疫系统的辨别能力。

　　hay fever 花粉过敏

　　asthma哮喘

　　Early-life exposure to microbes is a very important determinant of later life sensitivity to allergic and so-called autoimmune diseases, such as hay fever, asthma, inflammatory bowel disease and others.早期接触微生物是晚年对过敏和所谓的自身免疫性疾病的提前预防,如花粉过敏、哮喘、炎症性肠病以及其他疾病。

　　fight infection 对感染或炎症起作用

　　These normally fight infection.这些细胞通常对感染或炎症起作用。

　　play in a reasonable amount of dirt 在常规的泥土中玩耍

　　Let your kids play in a reasonable amount of dirt and get outside and get exposed to a diversity of things."让孩子在常规的泥土中玩耍，走出家门，接触各种各样的事物。