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THE EARTH'S MAGNETIC FIELD AND GLOBAL GEOLOGIC PHENOMENA IN MID-CRETACEOUS 白垩纪中期地球磁场与全球地质现象
The magnetic field of the earth creates a torque around the pivot. 地球的磁场在支点周围产生一个转矩。
Usually the earth's magnetic field acts as a shield. 平常，地球磁场构成了一个保护屏。
The latest piece of the puzzle is superoxide, an oxygen molecule that may combine with light-sensitive proteins to form an in-eye compass, allowing birds to see Earth’s magnetic field. 最新的谜题是过氧化物，这是一种氧分子，它可以与一些光敏蛋白质化合，在眼球中形成一个罗盘，让鸟儿们可以看到地球的磁场。
Pigeons navigate less accurately when the earth's magnetic field is disturbed. 地球磁场受到干扰时，鸽子的道航能力就会变得不准确。
The earth's magnetic field protects us from the sun's harmful radiation. 地球磁场让我们免受太阳辐射的伤害。
The Van Allen belts are composed of charged particles trapped by the earth's magnetic field. 范阿伦带由地球磁场俘获的带电粒子所组成。
The Earth's magnetic field is constantly changing,and the way,which it changes,also changes. 地球磁场总是在不停地变化，并且其变化的方式也在变化。
If the sun were a rigid body, its magnetic field might resemble the earth's, with symmetrical field lines like a bar magnet's. 如果太阳是一颗固体星球，其磁场或许与地球磁场相似，像条状磁铁那样具有对称的磁力线。
But after a period of time they reorient the dances to the earth's magnetic field. 但过了一段时间之后，它们的飞舞重新取向于地磁
Either of two points where the lines of force of the Earth's magnetic field are vertical. 磁力线在地球表面是垂直的两点之一。
Geophysicists have long known that the source of the fluctuating magnetic field lies deep in the center of the earth. 地球物理学家很早就知道，地球磁场变化的原因深藏于地球中心。
Our pilotless rocket enters the track of the earth. 我们把一个无人驾驶的火箭送入了地球的轨道里。
The Earth's magnetic field is constantly changing, and the way, which it changes, also changes. 地球磁场总是在不停地变化，并且其变化的方式也在变化。
We know from magnetic records locked in rocks that the earth's magnetic field has reversed many times in the past. 我们从锁定在岩石中的磁记录中知道，地球磁场在过去倒转了很多次。
The attraction of the moon for the earth causes the tides. 月球对地球的吸引力造成潮汐。
An instrument used to determine the angle of the earth's magnetic field in respect to the horizontal plane. 磁倾仪用来测定地球磁场相对于水平面的角度的仪器
The earth is only a speck in the universe. 地球在宇宙中只不过是一个小点罢了。
An iron case will keep the Earths magnetic field away from the compass. 铁箱能使地球磁场影响不了指南针。
They can track the earths magnetic field as sensitively as a compass needle. 它们对地球磁场也十分敏感，如同使用了指南针。