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Copper is a mineral that our bodies need from enzymatic processes
人體需要銅完成酶的作用
yet not all the functions of copper are completely understood.
但銅的全部功能還不為我們所知，
Food sources for copper include organ meats such as liver and shellfish, nuts, seeds, legumes and dried fruits.
銅的食物來(lái)源包括肝等動(dòng)物內(nèi)臟，貝類，堅(jiān)果，種子，豆類和干果，
The RDA for copper is 900 micrograms.
銅的RDA是900毫克
Although not all the functions of copper in our physiology are understood,
雖然我們并不知道銅在生理機(jī)能中的全部作用，
if we are deficient in copper anemia and bone abnormalities can result.
體內(nèi)缺乏銅會(huì)導(dǎo)致貧血和骨骼異常
Zinc has a role in energy metabolism, tissue formation and alcohol detoxification in our bodies,
鋅對(duì)于人體的能量代謝，組織生成和酒精解毒有其作用，
as it is a cofactor for certain enzymes that perform these functions.
因?yàn)樗峭瓿蛇@些功能的酶的輔助因素
Zinc is also necessary for sexual maturation and our ability to taste and smell.
性成熟以及味覺(jué)和嗅覺(jué)功能也需要鋅，
Sources for zinc include oysters, wheat germ, liver and whole grains.
鋅主要來(lái)源于牡蠣，麥芽，肝和整粒谷物
The RDA for zinc is 11 micrograms for males and 8 micrograms for females.
對(duì)于男性，鋅的RDA為11毫克對(duì)于女性是8毫克，
There are numerous products on the market containing zinc that are advertised as cold treatments.
市場(chǎng)上有無(wú)數(shù)含鋅產(chǎn)品，廣告稱可以治感冒，
Zinc does kill bacteria in a petri dish
在培養(yǎng)皿中鋅確實(shí)能殺死細(xì)菌，
but it is not clear that it can also work in the body.
但是在體內(nèi)是否如此并不清楚，
Zinc concentrations in cells and the blood are very carefully controlled
細(xì)胞和血液中的鋅濃度受到精細(xì)控制，
because unbound zinc would kill cells.
因?yàn)檫^(guò)量的鋅會(huì)殺死細(xì)胞，
Because zinc is a toxic metal high intakes in supplements should be avoided
由于鋅是有毒金屬元素應(yīng)該避免過(guò)高的補(bǔ)充攝取
especially since there is no good scientific evidence for efficacy in cold therapy.
尤其是目前并沒(méi)有科學(xué)證據(jù)證明鋅有治療感冒的作用，
The main role for selenium in the body is as part of the anti-oxidant enzyme glutathione peroxidase.
人體中硒的主要作用是作為抗氧化酶
Because of this role selenium has been linked to lower levels of certain types of cancer.
谷胱甘肽過(guò)氧化物酶的組成成分由于硒有這種作用，認(rèn)為它和某些早期癌癥有一定聯(lián)系，
A current study is focused on selenium and prostate cancer for example.
比如最近就有研究著眼于硒和前列腺癌，
Food sources for selenium include grains, meat, poultry, fish or dairy products.
硒的食物來(lái)源有谷物，肉類，禽類，魚(yú)和奶制品
However, selenium levels in food depend on where the food originated.
但是食物中硒的含量取決于食物來(lái)自哪里，
Soils that are deficient in selenium will yield crops that have lower levels of selenium.
缺乏硒的土壤長(zhǎng)出的作物中含硒量就低
For example areas of Nebraska and North Dakota have high levels of selenium in the soil.
比如內(nèi)布拉斯加州和北達(dá)科他州地區(qū)的土壤中含硒量高
The people in these areas have correspondingly high levels of the mineral in their diet.
這些地區(qū)的人口飲食中就有更多的硒，
In contrast parts of Russia and China have low levels in the soil
相反，俄國(guó)和中國(guó)的一些地區(qū)土壤含硒量少，
and more cases of deficiency occur in residents of those areas.
那些地區(qū)居民中就有更多缺硒的情況
The RDA for selenium is 55 micrograms which is readily attainable through diet.
硒的RDA是55毫克，通過(guò)正常飲食就能輕松獲得，
Supplementation of this mineral is not necessary to meet the RDA.
不需要額外補(bǔ)充硒來(lái)達(dá)到這一RDA
These fascinating minerals play important roles in the physiology of our body.
這些神奇的礦物質(zhì)在我們身體的生理機(jī)能中發(fā)揮重要作用，
New information about these minerals is still being investigated.
關(guān)于這些礦物質(zhì)還有更多信息正在研究中
Minerals are present in most foods
大部分食物中都含礦物質(zhì)
and the RDAs can usually be met by eating a balanced diet containing a variety of foods.
通過(guò)平衡飲食，兼顧各種食物就能達(dá)到這些RDA的要求
