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trace material
desert.	痕量物质
water.res., ecol.	微量物质
trace material 1. Both metals and non-metals, essential for the metabolic processes of algae, invertebrates and vertebrates. Organisms that derive nearly all their energy via photosynthesis are especially dependent upon dissolved trace substances. 2. Impurities that are present at small but detectable levels
environ.	微量物质 (1. 对于藻类、无脊椎动物和脊椎动物的新陈代谢过程必不可少的金属和非金属。对于几乎所有能量来源于光合作用的生物体尤其依赖于溶解的微量物质。2.在很小但可探测的级别出现的杂质。)

trace material : 1 phrase in 1 subject

Explosives and Explosive Ordnance Disposal

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