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1·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。

2·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。

3·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。

4·In March of that year James Clerk Maxwell, a Scottish physicist, published the first piece of a four-part paper entitled On physical lines of force.

那一年3月份的时候，一位苏格兰物理学家，詹姆斯·克拉克·麦克斯韦，发表了他论文《论物理的力线(On physical lines of force)》四部分的第一部分。

5·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。

6·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。

7·In March of that year James Clerk Maxwell, a Scottish physicist (pictured above), published the first piece of a four-part paper entitled On physical lines of force.

在那一年的三月，詹姆斯·克拉克·麦克斯韦，一个苏格兰物理学家(见上图)，发表了题为《论物理的力线》论文四个部分中的第一个部分。

8·If live in direction, cover frame-uply curtilage, lines of force is necessarily sideways cut your body, although what not likely has to hinder greatly, but always not as good as former good.

假如住在方向不正的套宅，磁力线必然是斜着切割你的身体，虽然不见得有什么大碍，但总不及前者好。

9·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。

10·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。