1. A piece of magnetite that has magnetic properties and attracts iron or steel. 
   天然磁石有磁性的磁铁矿，能吸引铁或钢
2. There is some evidence that our own brains may contain grains of magnetite. 
   有些证据表明在我们自己的大脑中也可能包含磁铁矿的微粒。
3. Other organisms have small areas in which the magnetic mineral known as magnetite is concentrated. 
   其他一些生物有一个被称作磁铁矿的磁性矿物集中的小区域。
4. a variety of chert containing magnetite and hematite; mined as a low-grade iron ore. 
   一种含磁铁矿和赤铁矿的燧石，作为一种低等的铁矿石被开采。
5. magnetite that possess polarity and has the power to attract as well as to be attracted magnetically. 
   具有磁极、能吸引也能被吸引的磁铁矿。

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