Physicists have succeeded in creating analogs of magnetic monopoles, however, in exotic materials known as "spin ice."
物理学家们已经成功制造出磁单极子的对应物，然而，用的材料是叫做“自旋冰”的诡异物质。
Since that pulls mass closer to the planet's spin axis, it causes the planet to rotate faster - just as an ice skater spins faster when she pulls her arms towards her body.
由于质量朝地球旋转轴靠拢，这就导致地球旋转速度加快- - -就像一个速度滑冰选手，当她把胳膊向身体收拢时就会旋转得更快。
The scenario is similar to that of a figure skaterdrawing her arms inward during a spin to turn faster on the ice.
这一情景就像花样滑冰运动员在冰上旋转时，为了让自己旋转得更快，她会将手臂内曲。
You can also try your hand at skiing or take an ice bike for a spin.
你也能试着亲手滑雪或者骑一辆冰上自行车转一圈。
The ice skater began to spin faster and faster.
滑冰选手开始越来越快地旋转。
The ice skater began to spin faster and faster.
滑冰选手开始越来越快地旋转。
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