您要查找的是不是：
- A naturally occurring or artificially produced radioactive element. 放射性元素自然产生或人为制造的放射性元素
- Naturally occurring mineral water, as at a spa. 矿泉水自然出产之矿质水，如矿泉中的水
- A biotechnology company is developing a range of new pesticide based on naturally occur 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。
- 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。
- A naturally occurring chemical formed during the oxidation of epinephrine. 肾上腺素红在肾上腺素氧化过程中自然形成化学物质
- 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。
- 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。
- Chocolate contains naturally occurring methylxanthines caffeine &theobromine. 巧克力中含有甲基化黄嘌呤？
- The cocoa bean is a rich source of naturally occurring polyphenol antioxidants. 可可豆是多酚抗氧化剂的一个富有的来源。
- Sometimes the Zionists take advantage of naturally occurring events. 有时候以黑帮分子会利用自然发生事件。
- Carnauba is the hardest natural occurring wax available. 巴西棕榈是一种天然的最硬物质。
- Silicon, naturally occurring in the form of silica and silicates, is the most important semiconductor for the electronics industry. 在自然界从硅酸盐和二氧化硅形式存在的硅是电子工业中最重要的半导体原材料。
- PE pipe is suitable for many chemical solutions. Naturally occurring chemicals in the soil will not degrade the pipe. 可耐多种化学物质的腐蚀，土壤中存在的化学物质不会对管造成降解作用。
- A naturally occurring ester of three fatty acids and glycerol that is the chief constituent of fats and oils. 甘油三酸酯甘油与三个脂及酸形成的天然的酯，是脂肪和油的主要成分
- I suspect that cases of this nature occur in Europe. 我以为欧洲有这样的情况发生。
- A naturally occurring mixture of an oil and a resin extracted from various plants, such as pine or balsam fir. 含油树脂一种天然的油和从各种植物如松树和胶杉中提炼出来的树脂的混合物
- 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”。
- 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。
- Organic chemistry embraces both naturally occurring substances like proteins, carbohydrate, 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”。
- Asbestos is a naturally occurring mineral used for centuries in insulation, clothing, and fire-resistant materials. 石棉是天然矿物绝缘用百年,衣服和耐火原料。
