它们被保存在自然环境中。
一个世纪之前，奥克塔维亚·希尔发起建立了国民信托组织，不是为了拯救时尚的楼房，而是“为公众永远保存自然场所之美”。
A century ago Octavia Hill launched the National Trust not to rescue stylish houses but to save "the beauty of natural places for everyone forever."
而在自然历史博物馆里，分类学家至今还能从保存的标本里发现尚未命名的标本。
Taxonomists at work in museums of natural history still find as yet unnamed specimens among the collections of preserved specimens.
由于纤维保存水分，塞满你的胃，所以比正常更少的热量就会让你的胃口自然感到满足。
And because fiber holds water, it fills your stomach, so your appetite is naturally satisfied with fewer calories than normal.
自然选择将保存重要功能的基因序列，但是其他基因会因为漂变而被改变。
Natural selection will preserve sequences with vital functions, but the rest of the genome will change because of drift.
它能被保存下来是因为自然只选择那些有生存优势的新特点。
It stuck, because natural selection favors new traits that give their owners a survival advantage.
随着人类活动增加，温室气体在大气层中的浓度超过了自然状态，过多热量被保存。
As human activity increases the concentration of these gases in the atmosphere far beyond their natural levels, much more heat is trapped.
大自然又在这里玩弄她保存自己的老把戏了。
Here is nature once more at her old game of self-preservation.
当地媒体报导称，这位61岁的老妇告诉警方，他母亲是高龄自然死亡；她保存母亲的尸体是因她无钱支付殡葬费。
Local media reported that the 61-year-old woman told police her mother died of old age and she kept the remains because she couldn't afford burial expenses.
自然也可以把这种方式扩展成计算额外的统计值，并在问题可能发生的地方保存单独的数据点。
Naturally, you could extend this approach to calculate additional statistics and to store individual data points where issues might arise.
奥姆斯特德的作品显得如此自然，以至于一位评论家写道：“令人以为这些东西并非人工布置，而是碰巧保存留下的。”
Olmsted’s works appear so natural that one critic wrote, “One thinks of them as something not put there by artifice but merely preserved by happenstance.”
该公司拥有一处保存了10000种自然物质的资料室，许多物质已经被使用了几千年，暗含着极大的药用价值。
The company has a library of 10, 000 natural substances, many of which have been used for centuries, that it is scanning for medical potential.
需要一个象保存这样的额外操作才能意识到存款事务是不自然的。
It's just unnatural to require an additional operation like saving for that deposit to be realized.
人们在面对压力时会很自然地选择保存自己，这是人类的天性。
It’s human nature to try to survive when put under pressure.
在这个自然保护区中，所有的稀有植物都保存良好。
In this nature_preserve, _all the rare plants are well preserved.
请允许我重提我们刚才讨论过的问题，我想我们应该强调保存我们的自然资源。
If I may refer back to the problem we discussed, I think we shall stress on the conservation of our natural resource.
请允许我重提我们刚才讨论的问题，我想我们应该强调保存我们的自然资源。
If I might refer back to the problem we were discussing, I think we should stress on the conservation of our natural resources.
大自然又在这里玩弄她保存自己的老把戏了。
Here is nature once more at her old game of self - preservation.
国家应该通过法律来保存任何尚存的荒野地区使其保持自然状态。
Nations should pass laws to preserve any remaining wilderness areas in their natural state.
自然界图片。大“手指”保存一只树蛙安全地固定到一片树叶上。
因此，涉及保护和保存一些自然和文化遗址的项目也成了生态旅游的一部分。
Therefore, programmes involving the conservation and preservation of some natural and cultural sites also form a part of ecotourism.
今天有一群一心奉献的自然主义者献上他们的时间与金钱，甚至于有时还得抵押房子去贷款，为的就是要保存另一种马——海马。
Today, a handful of dedicated naturalists are giving time, money and even the occasional home mortgage to help preserve a different kind of horse — the seahorse.
其实，这个神话保存了古代先民的原始记忆，是对远古时代“幻日”这种自然天象的一种幻想性解释。
In fact, this myth keeps an immemorial memory of the ancient people, which is a kind of imaginary explanation of a nature phenomenon of "Mock Sun" in ancient times.
咖啡精是在冻结和升华的过程中脱水，保存了自然咖啡的特点。
Coffee extract is dehydrated by freezing and sublimation process, preserving the characteristics of natural coffee.
这些景观应该可以使它们自己保存并存活下来，并成为本地环境自然生态圈的一部分。
These landscapes should maintain themselves and survive by being part of the natural cycles of the local environment.
同时，论证农业起着维持地域社会和生活，保全自然环境，保存农业社会中的传统文化等多方面功能。
At the same time this paper demonstrates that agriculture can keep the local community and life, preserve natural environment, and conserve traditional culture in agricultural society.
同时，论证农业起着维持地域社会和生活，保全自然环境，保存农业社会中的传统文化等多方面功能。
At the same time this paper demonstrates that agriculture can keep the local community and life, preserve natural environment, and conserve traditional culture in agricultural society.
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