The magnetic lines of force don't exist , they are defined by scientists.
磁力线并不存在，它是由科学家所定义。
It has been suggested that birds can sense the magnetic lines of force stretching from the north to south magnetic poles of the earth, and so direct themselves.
有人认为，鸟类能觉察得出地球自北向南磁极的磁力线，因而能为自己导向。
The existence of electric current in the conductor(not closed)which is cut-ting the magnetic lines of force(B-lines) variably in the magnetic field is pointed out, and the acceleration is discussed.
指出了在磁场中做变速切割磁力线（线）运动的导体（不闭合）中有电流存在，讨论了其运动加速度。
High in the polar regions, the lines of magnetic force point almost straight upwards.
在极地的高空，磁力线几乎是垂直指向上方。
When a charged particle is in a magnetic field, it tends to travel along that field's lines of force, spiralling as it goes.
当一个带电微粒在磁场中时，它会倾向于沿着磁力线螺旋运动。
As is mentioned above, a strengthened field is created where the lines of force in the two magnetic fields are parallel and have the same direction.
如上所述，两个磁场的磁力线相互平行且方向相同时，就形成了一个加强磁常。
A changed particle moves along the lines of force of a magnetic field, spiraling as it goes.
带电粒子沿磁力线运动时就会发生回转。
Place any magnet under the unit and set it on an overhead projector-and you will see the filings moving to line up along the lines of magnetic force.
将一磁铁放在盒下并将它放在一投影机下面——你即可看到铁粉随著磁力线的分布而移动。
Place any magnet under the unit and set it on an overhead projector-and you will see the filings moving to line up along the lines of magnetic force.
将一磁铁放在盒下并将它放在一投影机下面——你即可看到铁粉随著磁力线的分布而移动。
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