n.磁鐵礦
They have just found a magnetite in this region. 他們?cè)谶@個(gè)地區(qū)剛剛發(fā)現(xiàn)一個(gè)磁鐵礦。
Scientists had long thought that no animal could manufacture magnetite. 長(zhǎng)期以來科學(xué)家們一直認(rèn)為沒有動(dòng)物可在體內(nèi)合成磁性物質(zhì)。
