They also require trace amounts of iron which limits phytoplankton growth in large areas of the ocean because iron concentrations are very low.
它们还需要微量的铁，由于海洋中铁的含量非常低，限制了浮游植物大面积的生长。
The lunar soil (regolith) contains iron, aluminum, calcium, silicon, titanium, and oxygen, as well as trace amounts of lighter elements such as carbon, sulfur, and nitrogen.
月球的土壤(风化层)含有铁、铝、钙、硅、钛和氧等元素，此外还发现有大量较轻元素如碳、硫和氮等。
It was reported that trace amounts of arsenic in iron ores, spherical ores and sintering ores were determined by GFAAS.
前言：采用石墨炉原子吸收法，测定了铁矿石、球团矿和烧结矿中微量杂质砷。
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