硝酸盐是水和土壤里天然存在的化学物质。
Nitrates are chemicals that occur naturally in water and the soil.
他们鉴定出四种不同的含铅物质，其中两种是人工合成的，并非天然物质。
They identified four different lead-based substances, two of which were man-made, not natural.
直到18世纪，大多数人所用的颜料都是由天然物质制成的。
Most people use previously, to the 18th century, pigments that were produced from earth.
所采用的颜料多为天然矿物质研磨而成，色彩明丽，千年不褪色。
The colour is bright and beautiful. It would not fade in a thousand years.
蜂蜜是天然的酸性物质。
微生物絮凝剂是一类由微生物产生的天然生物高分子物质。
Microorganism flocculation was a kind of natural organism high-element material.
由细胞生成，亦可在实验室中合成的天然物质。
Natural substances made by cells. They can also be made in the lab.
本研究的目的是为了从海藻中获得天然抗病活性物质。
The object of this research was to get some natural active substances from algae.
细胞因子是由细胞制造的天然物质，也可以在实验室中进行制备。
Cytokines are natural substances made by cells. They be made in the lab.
随着研究的深入，被揭示的天然抗菌物质越来越多。
More and more antimicrobial substance has been found with the developing of its research work.
事实上它们所含的天然香精与化学物质都是无色的。
Actually, the natural flavor essences and the chemicals they contain are colorless.
天然胶乳，天然橡胶，含有该物质的橡胶组合物及轮胎。
Natural rubber latex, natural rubber, rubber composition containing the same, and tire.
巧克力含特殊的天然化学物质能使你快乐。另外，它偿起来很美味！
Chocolate has special natural chemicals that make you happy. Plus, it tastes so good!
「乙烯基」并不是一种天然物质，而是一种人工合成的材料。
Vinyl is a plastic material, which unlike other plastics, can easily be recycled.
人工合成的化学物质与这种天然杀手没有关系。
自然供给有益人体的天然矿物质类。
The body's natural supply of useful types of natural minerals.
原材料指用以生产工业品的天然物质。
Preparation and Property of Desiccants Which are Made from Natural Material;
原材料指用以生产工业品的天然物质。
Preparation and Property of Desiccants Which are Made from Natural Material;
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