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　　havelow iron in one's blood血液里铁含量很低
　　Many people have low iron in their blood. 许多人的血液里铁含量很低。
　　brain and central nervous system大脑和中枢神经系统
　　Iron is important to the development of a baby's brain and central nervous system.铁对婴儿大脑和中枢神经系统的发育很重要。
　　a micronutrient一种微量营养素
　　Iron is a micronutrient. Micronutrients are important substances that are found in small amounts in foods.铁是一种微量营养素。微量营养素是存在于食物中的极少量的重要物质。
　　intellectual and fine motor abilities智力和运动能力
　　They found improved intellectual and fine motor abilities among those whose mothers had received iron and folic acid during pregnancy and for three months after.他们发现，那些母亲在怀孕期间和怀孕三个月后接受铁和叶酸补充的人，智力和运动能力都有所提高。
　　develop respiratory infections患呼吸道感染
　　It says newborns with the lowest levels were twice as likely to develop respiratory infections as those with normal levels of vitamin D.报告说，维生素D水平很低的新生儿患呼吸道感染的可能性是正常水平的新生儿的两倍。
　　helps build strong bones建立强壮的骨骼
　　strengthens the body's defenses against disease加强身体对疾病的防御能力
　　Vitamin D helps build strong bones and strengthens the body's defenses against disease.The vitamin is commonly added to cow's milk and also found in supplements.But vitamin D is calLED the sunshine vitamin. The body naturally produces it from sunlight.维生素D有助于建立强壮的骨骼，加强身体对疾病的防御能力。维生素D通常存在于牛奶中，也存在于补充剂中。但维生素D被称为阳光维生素。身体自然地从阳光中产生并吸收它。
　　have lowlevels of vitamin D维生素D含量低
　　And what we found was that children who had the lowest levels of vitamin D had a high risk of developing infections and wheezing throughout childhood."我们发现，维生素D含量很低的儿童在整个童年时期都有感染和患哮喘的高风险。