BHP, Rio Tinto and Brazilian mining company Vale are the top three suppliers of iron ore to China.

必和必拓、力拓及巴西淡水河谷矿业公司是中国的三大铁矿石国际供应商。

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The three vertices of the iron triangle collapse into one vertex of the Agile triangle called constraints.

传统铁三角的三个顶点转变为“敏捷三角形”的一个顶点，被称为约束。

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Usually, iron loses two or three electrons.

通常情况下，铁原子丧失2 - 3个电子。

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The nearly 15-foot-tall front gate was hand worked from wrought iron with three-dimensional flowers, gold-painted leaves and curving vines.

WSJ: Western Splendor in Hong Kong

For Christmas, 2009, they gave him a three-hundred-and-fifty-dollar soldering iron.

NEWYORKER: Machine Politics

Because some users turn the crank-handle faster and harder than others, a nifty three-stage gearbox and a dynamo based on powerful neodymium-iron-boron magnets is used to ensure that efficiency is largely independent of the torque applied.

ECONOMIST: MONITOR