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单词 up the irons
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That iron-containing myoglobin starts out red, but as it heats up the iron in its heme group oxidizes and it turns this brown color.

含铁的肌红蛋白开始是红色的,但是当它加热血红素组中的铁时,它会氧化并变成棕色。

雅思听力全真试题15

What it was doing was preventing the trees from sucking up the iron they needed for healthy growth.

这种石灰会阻止树木吸收它们健康成长所需的铁质。

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