This special form of vitamin D is naturally present in breast milk.
这种特殊形式的维生素D天然存在于母乳中。
The exhibition traces the history of graphic design in America from the 19th century to the present.
这个展览会追溯了从19世纪到现在美国平面设计的历史。
It studies these populations in the past, present and future using quantitative data and mathematical models as tools of analysis.
它使用定量数据和数学模型作为分析工具，研究这些人口在过去、现在和未来的情况。
It studies these populations, in the past, present and future, using quantitative data and mathematical models as tools of analysis.
它使用定量数据和数学模型作为分析工具，研究这些物体在过去、现在和未来的数量。
In view of the present situation, we'll have to revise our original plan.
基于目前这种情况，我们不得不修改原来的计划。
The amount of energy that can be produced anaerobically is a function of the amount of glycogen present—in all vertebrates about 0.5 percent of their muscles' wet weight.
能以无氧方式产生的能量是存在的糖原量的功能——在所有脊椎动物中，糖原量约占其肌肉湿重的0.5%。
Central heating was present in every upper-middle-class home by the second half of the 19th century.
到19世纪下半叶，中央供暖系统已出现在每个中上层家庭里。
Where are you in the cycle of renewal: Are you actively preserving the present, or selectively forgetting the past, or boldly creating the future?
你处于更新周期的哪个阶段：是积极维持现状，还是选择性忘记过去，又或是大胆创造未来？
We are guided by a belief that good things will happen for us in the future if we take proper care of the present.
我们被这样一种信念指引着：如果我们过好现在的生活，未来就会有好事发生。
Thirty people were present and all except me came from the island, called Makelua, in the nation of Vanuatu.
研讨会共有30人出席，除我以外，都来自瓦努阿图国一个名叫马基鲁瓦的岛屿。
There's a way in which the context of the war, too, shadows the poem and remains present in it.
在某种程度上，战争的背景也投影于这首诗，并一直存在于诗中。
One could therefore present Napoleon in terms of his desire to impress or Churchill in terms of his lonely melancholy.
因此，人们可以从渴望给人留下印象的角度介绍拿破仑，或者从孤独忧郁的角度介绍丘吉尔。
It isn't a school subject or an academic discipline, but it can be learned; It is a quality that is required of artists, but it is also present in the lives of scientists and entrepreneurs.
它不是一门学校的科目或学术学科，但它是可习得的；这是艺术家必须具备的品质，但它也存在于科学家和企业家的生活中。
The supply of oil can be shut off unexpectedly at any time, and in any case, the oil wells will all run dry in thrty years or so at the present rate of use.
石油供应可能会随时意外中断；不管怎样，以目前这种消费速度，只需30年左右，所有的油井都会枯竭。
The interviews present a remarkable snapshot of Britain in these dark days of recession.
这些访谈深刻地展现了英国在黑暗的经济大萧条时期的点滴情况。
The present system is in want of a total review.
目前的系统需要全面的审查。
Levels of pollution present in the atmosphere are increasing.
大气中的污染程度正在加深。
The press is loaded in favour of this present government.
新闻界倾向于现任政府。
Those present were in favour of change.
在座的人都赞成变革。
Analysis showed that traces of arsenic were present in the body.
分析显示，尸体中有微量砒霜。
The overwhelming majority of those present were in favour of the plan.
绝大多数与会者都赞同这个计划。
At present, in many parts of China, paper cutting skill has become a must for women and a symbol of a clever mind.
目前，在中国的很多地方，剪纸已经成为女性的必修技能和头脑聪明的象征。
At present, throughout the world, over 80% of the land that is suitable for raising crops is in use.
目前，在世界范围内，80%以上适合种植农作物的土地都在使用中。
The beauty of rereading lies in the idea that our bond with the work is based on our present mental register.
重读的美妙之处在于，我们与作品的联系是建立在我们当前的心理状态上的。
They argue that the first hunter-gatherers to develop rice agriculture must have done so in this southern zone, within the apparent present-day geographic range of wild rice.
他们认为，最早发展水稻农业的狩猎采集者一定是在这个南部地区，在现在野生水稻明显的地理范围内。
This germ—which is present in soil and water, not feces—is responsible for "swimmers ear", an itchy or painful inflammation of the ear.
这种细菌——存在于泥土和水中，而非粪便——是造成“游泳耳”的主要原因，症状是耳朵发痒疼痛和红肿。
All four of these pitfalls are present in the life of Noah, and we can learn from him how to handle these tests.
这四个陷阱都存在于诺亚的生活中，我们可以向他学习如何面对这些考验。
Such ice cores trap gases, bits of dust, and other chemicals that were present in the snow that fell over Greenland for thousands of years and then became compressed into ice.
这些冰芯将气体、尘埃和其他化学物质封存在格陵兰岛数千年来的积雪中，然后被压缩成冰。
What to do with Wendy in her present delicate state of health?
温迪现在身体虚弱，怎么办呢？
They were, rather, a loose collection of songs transmitted by generations of Greek bards, and only redacted in their present form at some later date.
相反，它们是由几代希腊吟游诗人传唱的散文集，只是后来才以现代的形式进行了编辑。
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