Nowhere in nature is aluminum found free, owing to its always being combined with other elements.
由于铝总是和其他元素结合在一起，所以在自然界中找不到游离的铝。
Those who suspect they were warm-blooded point out that dinosaur bone is generally fibro-lamellar in nature.
那些怀疑恐龙是温血动物的人指出，恐龙的骨骼在本质上通常是纤维层状的。
In nature, itching and scratching help animals get rid of parasites, plant material, or other unwanted baggage.
事实上，骚痒和抓挠帮助动物去掉寄生虫、植物体或其它不想要的垃圾。
The active discipline of heightening one's perception of what is enduring in nature would have been his idea of the high.
他心目中的高层次应该是这样一种积极的自律，即强调一个人对自然界永恒之物的感悟。
Nowhere in nature is aluminum found free, owing to its always being combined with other elements, most commonly with oxygen.
由于铝总是和其他元素结合在一起，最常见的是和氧结合，所以在自然界中找不到游离的铝。
Nowhere in nature is aluminum found free, owing to its always being combined with other elements, most commonly with oxygen.
由于铝总是和其他元素结合在一起，最常见的是和氧结合，所以在自然界中找不到游离的铝。
The reason for this is easy to recognise: in nature, the existent organisms either adapt or are regularly replaced by new types.
原因很容易理解：在自然界中，现存的生物要么适应环境，要么被新物种取代。
Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree.
爬行动物的骨骼生长在本质上是周期性的，在骨头上产生一系列的同心圆，就像树木的年轮一样。
Agriculture takes place in nature, among ecosystems of interacting organisms and activity, and crop production takes place within that ecosystem environment.
农业是在大自然中进行的；大自然里的生态系统中各种生物和活动相互影响，而粮食的生产正是处在这样的生态环境中。
Many species are similar enough that hybrid offspring are possible and may often occur in nature, but for the majority of species, this rule generally holds.
许多物种非常相似，因此有可能杂交繁衍出后代，而且这种情况可能经常在自然界中发生；但对于大多数物种来说，这一规则大体适用。
As Masurium, it was the first element discovered that occurs in nature only from spontaneous fission, and as Technetium, it was the first element discovered in a laboratory.
作为Masurium，它是在自然界中发现的第一种只能通过自然裂变产生的元素；作为锝，它是在实验室中发现的第一种元素。
Conservationists are mostly wedded to preserving diversity in nature.
自然环境保护主义者大多致力于保持物种的多样性。
There are many colors in nature.
大自然有很多颜色。
That's why it is called a born singer in nature.
这就是为什么它被称为自然界中天生的歌唱家。
In nature, they often nest on mountaintops and on the sides of cliffs .
在自然界中，它们经常在山顶和悬崖边筑巢。
People prefer food such as fruit and vegetables rich in vitamins and cool in nature.
人们喜欢富含维生素、性凉的水果和蔬菜等食物。
When he was 24, he published (发表) two papers in Nature on May 6th.
5月6日，24岁生日的那天，他在《自然》上发表了两篇论文。
Blue, in comparison with bright colors, is said to lower people's appetites because few foods are blue in nature.
据说，与明亮的颜色相比，蓝色会降低人们的食欲，因为自然界中鲜有食物是蓝色的。
According to a study in Nature Climate Change, the number of most polar bears will fall rapidly by 2080.
据《自然气候变化》的一项研究显示，到2080年，几乎大多数北极熊的数量都将急剧减少。
In their 2017 study published in Nature Communications, participants were able to pick out sound features that they had heard during sleep.
在他们2017年发表在《自然——通讯》上的研究中，参与者能够分辨出他们在睡觉时所听到的声音特征。
Milu habitats (栖息地) are usually centered around water, and fishing equipment that used to be a threat to the animals is no longer seen in nature reserves.
麋鹿的栖息地通常以水为中心，而过去对其构成威胁的捕鱼设备在自然保护区内已不复存在。
In the world of animals in nature, the young may not be so lucky or easy to find a foster parent if their parents die or lose the ability to raise them.
在大自然的动物世界中，如果幼崽的父母死亡或失去了抚养的能力，幼崽们可能不会那么幸运或轻易地找到养父母。
Some uses of color in nature remain unknown, but one thing is for sure, color not only makes our planet beautiful but it is also necessary for our planet to live on.
颜色在自然界的一些用途仍然未知，但有一件事是肯定的，颜色不仅使我们的星球变得美丽，也是我们的星球得以生存的必要条件。
Influenced by the growing interest in nature, more and more people enjoy outdoor sports.
由于人们对大自然的兴趣日益浓厚，越来越多的人喜欢上了户外运动。
In 1842 Darwin went to live in Kent, where he continued his studies of changes in nature.
1842年，达尔文去了肯特郡居住，在那里他继续研究自然界的变化。
In a study published in Nature Scientific Reports, we reveal just how deep this injustice runs.
在《自然科学报告》上发表的一项研究中，我们揭示了这种不公正现象有多严重。
Still, if you're interested in nature, then that certainly can be worked into your dissertation.
不过，如果你对自然感兴趣，那当然可以写进你的论文。
Why people are so excited about embryonic stem cells is because in nature they become all the cells of the body.
胚胎干细胞如此让人激动是因为它的天然功能就是分化成身体所有的细胞。
Around half of ocean heat intake since 1865 has taken place since 1997, researchers report online in Nature Climate Change.
研究人员在《自然气候变化》网站上报告称，以1865年为起点，大约一半的海洋热量摄入发生在1997年之后。
Being somewhat skeptical in nature, he decided to stop using the mangosteen juice as a treatment for his allergic rhinitis for one day.
因为对自然界的怀疑，他决定停止一天使用山竹果作为治疗过敏性鼻炎的药物。
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