| 1. | Locations on the earth's surface are specified in terms of the earth's axis of rotation .
地面的定位是沿着地球的自转轴而定的。 |
| 2. | It takes about 25 , 800 years to complete one cycle
因为地球的自转。 |
| 3. | It is this heat energy , combined with the rotation of the earth , that drives a hurricane
正是这些热能，加上地球的自转驱动着飓风。 |
| 4. | For the earth , the rotational axis tilts 23 . 5 . as a result , there is no seasonal change in venus
地球的自转轴倾角为23 . 5 ，所以金星并没有四季之分。 |
| 5. | This is because as earth turns , air is pulled to the right in the northern hemisphere . in the southern hemisphere , air is pulled to the left
由于地球的自转，在北半球空气被拉动向又旋转，而相反在南半球被拉向左边。 |
| 6. | Like a spinning top , the rotational axis of the earth is not fixed in space . it will move in a circle with a period about 26000 years . we call this the
像转动中的陀螺一样，地球的自转轴在太空中其实并不固定，而是以26000年的周期在转动，这个运动称为 |
| 7. | Since the rotational axis of the earth is tilted from the revolution axis by 23 . 5 , the sun , for example , rises at different directions at different times during the year
由于地球的自转轴相对于公转轨道平面倾斜了23 . 5度，再加上地球的绕日运动，所以太阳东升的方位角会随日子改变。 |
| 8. | Birds and compasses know north from south because , like a giant bar magnet , the earth ' s magnetic field has two poles that line up closely with the planet ' s axis of rotation
候鸟与指北针都知道何为北方、何为南方，因为地球就像一条巨型磁铁棒，它的磁场有两极，且这两个地磁的磁场线和地球的自转轴非常接近。 |
| 9. | Although it is possible to have a negative leap second - that is , a second deducted from coordinated universal time - so far all have been add - ons , reflecting the earth ' s general slowing trend due to tidal braking
尽管也有实施负闰秒制从协调世界时中扣除一秒的可能，但迄今为止，只有加，没有减，这说明由于受潮汐减速的影响，地球的自转速度大体上呈减慢趋势。 |
| 10. | Although it is possible to have a negative leap second - - that is , a second deducted from coordinated universal time - - so far all have been add - ons , reflecting the earth ' s general slowing trend due to tidal braking
尽管也有实施负闰秒制（从协调世界时中扣除一秒）的可能，但迄今为止，只有加，没有减，这说明由于受潮汐减速的影响，地球的自转速度大体上呈减慢趋势。 |
