The bath compositions of trivalent chrome black passivation for zinc-iron alloy coating were optimized by orthogonal test method.

采用正交试验法对锌-铁合金镀层三价铬黑色钝化工艺进行优化，并研究了工艺参数对钝化膜外观和耐蚀性等影响。

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Raspberries contain a little more protein, iron and zinc.

树莓含有更多的蛋白质、铁和锌。

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China accounts for more than half the world's consumption of cement, and nearly half its use of iron, coal, lead, zinc, aluminum and pigs.

中国的水泥消费量占全球一半以上，铁、煤、铅、锌、铝和猪肉使用量占全球近一半。

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The unremitting decline of commodity prices -- zinc, lead, iron, oil -- reminds him of the 1930s.

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People who eat no animal foods run the risk of nutritional deficiencies such as a lack of vitamin B-12, iron and zinc and the powerful Omega-3 fatty acids found in fish, she said.

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Citigroup estimates that the spot price is below the production costs for 15% of copper producers, 25% of aluminium producers, 50% of zinc producers, 30% of nickel producers and 10% of iron-ore producers.

ECONOMIST: Fortunes in the mining business come and go faster than ever