它绕着自己的轴旋转；地轴是一条想像的穿过地球中央的、从北极到南极的线。
It turns around its axis, an imaginary line that goes straight through the middle of the earth from the North Pole to South Pole.
采取这样的农业生产方式，以及把一些农场迁到邻近城市中央的地方，将对人类和地球都有利。
Both people and the planet would benefit by such treatment of agriculture and location of some farms in closer proximity to the city centers.
举例来说由熔岩冷却的而来的岩石，位于深深的海中央山脊的地方就形成了地球表面的板块，水晶晶体排列方向与磁场方向一致。
As the rocks cool from lava, for instance at the deep mid-ocean ridges where the earth's surface plates are formed, crystals line up with the direction of the magnetic field.
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