The scientists then added powdered magnetite, an iron oxide present on Mars, to the flasks.

科学家接着又往烧瓶内加入粉末状磁铁矿和火星上现有的一种氧化铁。

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Their very titles stand as totems of an earlier era: “Japan’s Ports—Past and Present”; “Iron and Steel: A Success Story”; “American Girl Finds Japan.”

其中的经典标题充分反映了这一早期时代的特征：《日本的进出口——过去和现在》、《钢铁：一个人的成名史》、《美国女孩眼中的日本》。

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Haem iron only exists in animal tissues, whilst in plant foods iron is present as non-haem iron.

血红素铁只存在于动物组织，而在植物性食品铁本作为非血红素铁。

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But because different iron minerals behave differently, scientists must know what iron minerals were present, according to Poulton.

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"Typically the concentrations are small in red mud and what is present is tightly bound to the particles of iron oxide, " he says.

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The studios behind "Iron Man, " Paramount and Marvel, also will present a panel for "Captain America: The First Avenger, " even though it is still a year away from release.

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