地磁学家们预测,到21世纪初期,地球的S极(南级)与N极(北极)将发生倒转。到那时,就像《乐府》诗中写的那样,将出现“正南看北斗”的奇异景象。我们的地球很像一块大磁石。跟普通的磁铁一样,它也有两个相对的磁极:S极在地球的北极附近;N极在地球的南极附近。早在2000多年前的战国时代,我们的祖先便利用天然磁铁制造了一种能指示方向的工具,叫做“司南”(指南针),它的形状像一把舀汤用的勺子。只要把“司南”放在一个光滑的盘子上,轻轻地 Geomagnetic scientists predict that by the early 21st century, the Earth’s S pole (south) and N pole (North Pole) will be reversed. By that time, as we wrote in the Yuefu poem, there will be a singular spectacle of “looking at the Beidou in the south.” Our Earth is like a giant magnet. Like a normal magnet, it has two opposite poles: the S pole is near the Earth’s north pole and the N pole is near the Earth’s south pole. As early as more than 2,000 years ago in the Warring States period, our ancestors used natural magnets to create a directional tool called a “compass” that shaped like a spoon for scooping soup. Just put “Secretary Nan” on a smooth plate, gently