n.磁鐵礦
They have just found a magnetite in this region. 他們在這個地區(qū)剛剛發(fā)現(xiàn)一個磁鐵礦。
Scientists had long thought that no animal could manufacture magnetite. 長期以來科學(xué)家們一直認(rèn)為沒有動物可在體內(nèi)合成磁性物質(zhì)。