这种天然物质经常会添加到饮用水里。
This natural element is often added to drinking water supplies.
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;
合成纤维，不是天然物质。
多氯联苯是天然物质？
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.
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.
「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.
无毒天然物质，将其当作一般泥沙处置即可，但须符合环保规范。
Non-toxic natural material, disposal as normal dirt, however should be in accordance with environmental regulations.
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.
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.
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.
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