naturally-occurring

Fluoride is a naturally occurring mineral that helps to safely strengthen tooth enamel and prevents cavities.

氟是一种自然存在的矿物质,能安全有效地巩固珐琅质,防止蛀牙.

Lactose a naturally occurring sugar found in milk.

乳糖是牛奶中的天然糖分.

A biotechnology company is developing a range of new pesticide based on naturally occurring toxin.

一家生物工艺开发公司正在根据自然滋生毒素的原理研制新型农药系列产品.

naturally occurring chemicals

天然存在的化学物质

Seventy of the 350 naturally occurring isotopes are radioactive.

自然界有350种天然同位素,其中70种有放射性.

Organic chemistry embraces both naturally occurring substances like proteins, carbonhydrate, fats and " essential oils ".

有机化学既包括自然存在的物质如蛋白质 、 碳水化合物 、 脂肪及 “ 香精油 ”.

Antioxidation: Glutathione is the major naturally-occurring antioxidant present in our cells.

抗氧化作用: 谷胱甘肽是人体细胞内自然生成的抗氧化剂.

The heaviest naturally occurring element is uranium, which has 92 protons.

自然存在的最重元素是铀, 有92个质子.

Asbestos is a naturally occurring fibrous mineral aggregates can be split into thin and flexible fiber.

石棉是天然纤维状矿物的集合体,可劈分成细而柔韧的纤维.

Naturally occurring rock oil is referred to as crude oil or petroleum.

天然形成之石油,我们称作原油或石油.

Fulvic minerals are naturally occurring. plant-derived substances that act as transporters for L-arginine and antioxidants.

褐菌矿物质是天然的植物提取成份,起着输送左旋精氨酸和抗氧剂.

Naturally occurring low-oxygen zones are regular features in some parts of the ocean.

海洋中的一些区域会自然形成低氧区,这是一种普遍现象.

The naturally occurring compounds are first purified and then synthesized.

这些自然产生的混合物首先经过提纯精制,然后将其合成.

The oil is attacked by naturally occurring microbes which break it down.

原油受到了自然产生的分解油类物质的微生物的侵蚀。

Oil is refined to remove naturally occurring impurities.

油经过提炼去除天然存在的杂质。

Antimony ( Sb) which belongs to the group VA in the periodic table is a naturally-occurring metalloid element.

锑（Sb）位于元素周期表第五周期第VA主族，原子序数为51，是一种天然存在的类金属元素。

Hardseedness is a naturally occurring phenomenon for many plants, especially leguminous species.

摘要硬实是植物中普遍存在的现象.

A Swiss study reported that while the weight of electronic goods represented by precious metals was relatively small in comparison to total waste, the concentrationof gold and other precious metals was higher in So-called e-waste than in naturally occurring minerals.

瑞士的一项研究报告显示，虽然贵金属类电子商品的重量比全部废品的要小，可与自然状态相比较，那些所谓的电子废品中所含黄金等贵金属的纯度更高。