Thiomersal does not contain methyl mercury, which is a naturally-occurring compound and whose toxic effects on humans have been well studied.
硫柳汞不含有甲基汞，后者是一种自然产生的化合物，其对人类的有毒影响已得到充分的研究。
Oil is refined to remove naturally occurring impurities.
油经过提炼去除天然生成的杂质。
Even more than mountainside slides of mud or snow, naturally occurring forest fires promote the survival of aspen trees.
自然发生的森林火灾甚至比山体滑坡或积雪更能促进白杨树的生长。
At present, we can make efficient use of only naturally occurring hot water or steam deposits.
目前，我们只能有效地利用自然产生的热水或蒸汽沉积物。
Apart from that, the process of heating up naturally occurring materials to transform them is the same.
除此之外，将天然生成的物质加热转化的过程也是如此。
The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface.
水通常是自然形成的地下水，沿着岩石的裂缝渗出；不那么典型的是，水是通过从地表抽水而人工引入的。
The blue specks are likely naturally occurring seashell particles or minerals.
蓝色斑点很可能是自然产生的海贝颗粒或矿物质。
It is a naturally occurring compound found in the soil saprotroph "Streptomyces rose sports".
它是在土壤腐生菌“玫瑰链霉菌”中发现的一种天然化合物。
The present disclosure provides ketoreductase enzymes having improved properties as compared to a naturally occurring wild-type ketoreductase enzyme.
与天然存在的野生型酮还原酶相比，本公开提供了具有改善的性质的酮还原酶。
An interesting choice being investigated by the team is a membrane that contains the naturally occurring F1 and F0 motors of the ATP-Synthase.
这个小组正在研究的一项有趣的对比选择是一种膜，它包含腺苷三磷酸合成酶(atp)自然发生的F1和F0发动机。
But he has a place in history as the last naturally occurring case in a continuing chain of transmission extending back at least 3,500 years.
但他作为最后一个天然发生的天花病例的历史地位在继续扩展传播链要返回到3,500多年前。
In 1977 ali Maow Maalin became the world's last person to contract naturally occurring smallpox.
在1977年阿里·马欧·马阿林成为世界天然发生天花感染的最后一个人。
Each DRACO also includes a "delivery tag," taken from naturally occurring proteins, that allows it to cross cell membranes and enter any human or animal cell.
每个DRACO还包括一个“传递标志”，来自于天然产生的蛋白质，允许其穿过细胞膜，进入任何人类或动物细胞中。
So it is difficult to know if a certain treatment actually works or was simply taken during a naturally occurring remission.
因此，很难获知究竟是某项疗程真正发生作用还是自然衰退导致的结果。
Rhenium (re) : the last of the naturally occurring elements to be discovered, this silvery metal is used in small amounts with nickel in jet engines.
铼：最后一种被发现的自然存在的元素。少量的这种银色金属与镍一并被用在喷气发动机中。
Radon is a chemically inert, naturally occurring radioactive gas without odour, colour or taste.
氡是一种自然产生的放射性惰性气体，它无色、无味、无臭。
Heat from the decay of naturally occurring radioactive elements could keep a planet warm enough for water.
放射性元素在自然衰败过程中所产生的热量能使星球上的水维持液态形式。
However it would not be accurate to limit fundamental risk to naturally occurring perils.
然而，把基本风险局限于自然危险是不准确的。
If nations are naturally occurring, then there is little reason to explain the birth of nations.
如果民族是自然产生的，民族的诞生便不用多做解释。
Metabolix has developed a process for making plastics by combining genes of several naturally occurring substances.
Metabolix公司已经形成了一套通过混合许多天然关系紧密的物质的基因生产塑料的程序。
A naturally occurring substance found in plants, animals and humans, squalene is synthesized in the liver and circulates in the human bloodstream.
角鲨烯是一种存在于植物、动物和人体中的天然物质，在人体肝脏内合成，并随血流循环。
Yes, we are talking about that naturally occurring waxy substance responsible for clogging up your arteries.
是的，我们说的就是能堵塞您的动脉血管的天然蜡状物体。
Organic arsenic, hence the name, is naturally occurring in the environment and can be found in many foods.
有机砷，由名字即可得知，它天然存在于环境当中，而且许多食物都含有有机砷。
What happens, she explained, is that naturally occurring Gulf bacteria "eat up" the vast amounts of methane and other gases.
她继续解释道，那些随之而来的海湾微生物会“吃掉”大部分甲烷和各种其他气体。
Children as young as three believe human-made objects are owned but naturally occurring things like pinecones are not.
三岁大的小孩相信人造的物品是被拥有的，而天然的物品，例如松果，却不是。
Arsenic and lead are also naturally occurring metallic elements that have varieties of USES in industry from insecticides to electronics.
砷和铅也是天然形成的金属元素，在工业上从制造杀虫剂到应用于电子工业，它们有着多种用途。
It usually means developing flavors from plant or bacteria by-products, or chemically treating naturally occurring molecules.
风味通常被认为是来自植物和细菌的副产品，或者说是天然分子之间发生的化学作用。
A naturally occurring sweetener, xylitol had primarily been known in Finland for its effectiveness in preventing tooth decay.
木糖醇是一种天然的甜味剂，芬兰人最初发现它可以有效预防龋齿。
A naturally occurring sweetener, xylitol had primarily been known in Finland for its effectiveness in preventing tooth decay.
木糖醇是一种天然的甜味剂，芬兰人最初发现它可以有效预防龋齿。
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