天然磁石

天然磁石是一种被雷电击中之后高度磁化的磁铁矿石（带有磁性的铁矿石），可以自然指向南北两极。

Lodestone is a type of magnetite ( a magnetic iron ore ) that becomes highly magnetized when struck by lightning . The result is a mineral that 's magnetized toward both the north and south poles .

是谁这么聪明，想出用天然磁石来辨别方向的主意，我们已不得而知，但据考古学资料显示，是古代中国人发明了杓，并使其能在占卜盘上平稳转动；

We 're not certain precisely who came up with the clever idea of discerning direction using lodestone , but archaeological evidence shows the Chinese fashioned ladles that balanced on a divining board ;

由于天然磁石因打击受热容易失磁，磁性较弱，因而司南不能广泛流传。

However , since was easy for natural loadstone ( magnetic iron oxide ) tolose its magnetism , Si Nan could not be widely used .

最早的指南针出现在公元前4世纪，由天然磁石磨制而成。天然磁石的存在委实是上天的眷顾。

The earliest compasses were created in the fourth century B.C. and were made of lodestone.The mere existence of lodestone is the result of a bit of luck .

天然能量保健磁石更有镇惊安神、聪耳明目、视物昏花、头晕目眩等功效。

The natural energy health care magnet has overcomes ones fears calms the nerves , the clever ear clear vision , regards the thing dim-sighted , has a dizzy spell and so on the effects .