楼主:综合结果 时间:2017年12月14日 21:17:59 点击:0 回复:0
It is thought to improve muscle strength and据说,它能够改善肌肉力量immune function and reduce inflammation.提高免疫功能,以及治疗炎症People at risk for vitamin D deficiency include容易缺乏维生素D的人群breastfed infants, older adults, people包括母乳喂养的婴儿,老人with limited sun exposure, people with dark skin接受日照有限者,深肤色的人and people with fat malabsorption. People age 50以及脂肪吸收不良的人and older are at increased risk of developing50岁以后,缺乏维生素D的几率会增大vitamin D deficiency because as they age因为随着年龄的增长the skin loses its ability to synthesize vitamin D皮肤会失去有效率地合成维生素D的能力as efficiently and the kidneys also convert肾脏向激活型的转化也会减少less to its active form. People living in居住北半球的人们,居家人士the northern latitudes, homebound individuals以及那些因为宗教原因and women who wear long robes and穿长袍,带头巾的妇女head coverings for religious reasons may not也许无法获得来自于阳光的充足的维生素Dobtain adequate levels of vitamin D from sunlight.也许无法获得来自于阳光的充足的维生素DPeople with darker skin have more pigment melanin肤色较深的人们有更多的黑色素which reduces the skin#39;s ability to produce黑色素会降低皮肤在太阳照射下vitamin D after sun exposure.生成维生素D的能力Prolonged inadequate intake of vitamin D长期的维生素D摄入不足will lead to impaired bone metabolism.会导致骨骼新陈代谢受损In children under mineralization of bone causes对于处于骨骼矿化时期的孩子soft and deformed bones and can lead to维生素D摄入不足会导致软骨和畸形骨骼the condition known as rickets. Rickets is rare可能会发展成为佝偻病in the US today but was fairly common佝偻病在今天的美国是很少见到的as recently as 100 years ago. When children developed但是在100年前,这一疾病在美国是很常见的rickets their legs were too weak to hold their weight当儿童患有佝偻病时,他们的腿会疲软无力resulting in bowed legs which often persisted不能够撑起他们的体重,最后导致双腿的弯曲into adulthood. Osteomalacia is the adult form这种情况会一直持续到成年时期of rickets and leads to impaired mobility软骨病是佝偻病成年化的形式and bone fractures. And osteoporosis is the condition会导致活动障碍和骨折that leads to weak and porous bones.软骨病会导致脆弱和疏松骨质Calcium is the most abundant mineral in the body.钙是人体最为丰富的矿物质There are two major roles for calcium.它有两个主要用途By far the majority of calcium found in the body到目前为止,研究发现is stored in the bones and teeth providing身体里大部分钙都贮藏在骨骼和牙齿中structural support. However there is a very small起到撑身体结构的作用and tightly controlled amount of calcium that然而,还有一小部分钙在血液里循环circulates in the blood. This calcium is required for血液钙含量得到严格的控制muscles to contract, blood vessels to expand血液里的钙质帮助肌肉收缩and contract, secretion of hormones and enzymes帮助血管扩张和收缩and transmission of impulses throughout促进荷尔蒙和酶的分泌the nervous system. All these functions are supported并且帮助传播神经系统里的脉冲with less than 1% of the total body calcium.所有这些功能只用到了人体中全部钙质的1%A wide range of people may be at risk for许多人也许会因为缺钙calcium deficiency. Children and youth require而威胁身体健康adequate amounts of calcium to ensure proper儿童和青少年需要充足的钙量bone development. Consumption of dairy products,来保正常的骨骼发育,在骨骼发育的时期particularly milk, during these developmental years乳制品,尤其是牛奶的摄入是非常重要的is of great importance. As adults bone mineral loss在衰老过程中,成年人骨骼中矿物质的流失begins to exceed accumulation in the natural超过了它的积累aging process. Post-menopausal women and绝经后的妇女以及老年人the elderly can become at risk of calcium deficiency会出现钙缺乏associated with bone loss. People with poor diets,并伴随着骨质疏松,这会给健康带来威胁particularly lacking in dairy foods due to膳食质量差的人,尤其是因乳糖不耐症lactose intolerance or vegetarianism may also be而缺乏乳制品摄入的人,或者素食主义at risk for calcium deficiency. If dairy foods可能会因为钙缺乏而对健康造成隐患are not tolerated calcium supplements如果无法食用乳制品should be considered at any age.那么很早的年纪就应该考虑食用钙补充剂 Article/201508/391408来自世界各地最令人瞩目的艺术家们拓展音乐边界,为观众带来眩人的表演和惊人的创意,感受大师的魅力。 Article/201501/352829我们都知道shit是骂人的话。但是呢,美语里shit还有好些其它用法。除了骂人,还有表扬哦!比如说一个东西超棒,你可以说,#39;it#39;s the shit!#39; 快看节目学习吧! Article/201507/387047The British wars began here, in St Giles#39;s Cathedral, Edinburgh,on the morning of July 23rd, 1637,1637年7月23日清晨 英国内战正式在爱丁堡的圣吉尔大教堂打响and the first missiles that were launched were not cannonballs,they were footstools.但第一波攻击并非是威力惊人的加农炮 相反 仅仅是一些脚凳They were launched straight down the nave,and their targets were the dean and bishop of the cathedral.它们被直接扔进教堂中殿 而它们的目标则是教堂的主任牧师和主教The right reverends had just started to from a royally authorised new prayer book,牧师和主教们正准备 朗读新的皇家授权的祈祷书and it was this attempt to from the liturgy which had triggered a deafening outburst of shouting and wailing,就仅仅是准备朗读的仪式 就已经使教堂内民众发出了 震聋发聩的哭喊与哀号especially from the many women gathered in the church.特别是激怒了聚集在教堂中的女性The prayer book riots, though, were just the fuse.但对祈祷书的反对浪潮 仅仅是一根导火索What those who lit it wanted was to blow up the bishops and the whole royal church establishment in Scotland.而点燃这条导火索的人 目的在于 撼动主教以及苏格兰皇家教会体系的根基On February 28th, 1638,a national covenant was signed in a four-hour ceremony1638年2月28日 在长达四小时 伴随着布道和圣歌的仪式上along with sermons and psalms exhorting the godly to be the new Israel.勉励着虔诚的人创造新的乐园 同时签署了公约The next day, the covenant was brought here to the open churchyard at Greyfriars,第二天 他们将公约带至 格雷弗赖斯的露天教堂墓地之中where hordes of ordinary Scots added their signature.在那里很多苏格兰人也共同签署了公约Copies were made and distributed the length and bth of Scotland.很快 公约的副本 就被分发到了苏格兰的大街小巷 /201703/497043

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栏目简介:《英语视频之Top5》是英语视频听力下的子栏目,栏目包含中英字幕,而且能够了解世界上5大新奇或者有意思的事物,比如美军飞行器、社交媒体、核武器等,通过简单有趣的讲述,能够提高学习英语的兴趣,积累一些英语知识,是比较生动的英语学习材料。 Article/201510/400358

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